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TT
3
5 tháng 1 2023
\(\dfrac{x^2+3\text{x}y+2y^2}{\left(x^3+2\text{x}^2y\right)-\left(xy^2+2y^3\right)}\)
=\(\dfrac{x^2+3\text{x}y+2y^2}{x^2\left(x+2y\right)-y^2\left(x+2y\right)}\)=\(\dfrac{x^2+3\text{x}y+2y^2}{\left(x+2y\right)\left(x^2-y^2\right)}\)
câu 17
11 tháng 11 2018
Đề TA
I. Điền hình thức đúng của động từ trong ngoặc:
1/ The Sun (rise) in the east and (set) in the west.
2/ My grandma (use) to tell me the folktales.
3/ She (not ) playing soccer.
4/ Where you (be) going to visit next summer?
I (visit) Hue.
5/ They (work) in this company for ten years.
6/ My mother has to (clean)the floor everyday.
7/ He (not write)to his friend since Monday.
8/ Students must (go) to school on time.
9/ I (get) a letter from my old friend yesterday
10/ Where he (use to)live before he moved here?
II. Hoàn thành các câu sau, dùng hình thức so sánh phù hợp:
1/ My house isn't as (big) her house.
2/ Milk is (expensive) than mineral water.
3/ This hotel is (cheap) in the town.
4/ She is wearing a hat (same) mine
5/ Ho Chi Minh City is (big) than Ha Noi.
6/ February is (short) of the year.
7/Life in the city is (busy).
8/ Nam is (intelligent) in my class.
9/ Lan is (pretty) as her sister.
10/ Her hobbies are (different) from yours
IV. Điền vào mỗi chỗ trống với một giới từ đúng
1/ They have built this house..............a long time.
2/ We have lived .....An Lao.....14 years.
3/ There are some books........the table........the right corner.......the room
4/ The course begins......January and ends .....April.
5/ I usually watch TV ......the evening.
6/ The stadium is in............of my house.
7/ He often gets up..........5.30...........the morning but.......Sunday morning he gets up late.
8/ English learners learn words ..............different ways
9/ Thank you very much ...........lending me your bike
10/ I got good grades.............English and Math last semester
11/ All students enjoy taking part ............outdoor activities
12. Should should learn ............heart these new words.
V. Hoàn thành các câu sau dùng đại từ phản thân phù hợp
1/ My brother can repair the bike ....................
2/ They have a great time. They really enjoy ......................
3/ Don't worry about us. We can look after ...................
4/ This exercise isn't difficult. Do it ...................
5/ She cut ....................
6/ I made this shirt ....................
VI. Đặt câu hỏi cho từ gạch chân:
1/ Hoa went to school late this morning because her bike broke down
2/ I have to tidy the living room everyday
3/ She'll be home after dinner
4/ Lan used to live on the farm when she was young
5/ My mother gave me a new bike on my 14th birthday
6/ Nam often walks to school
7/ I need to improve Math and English
8/ Nga studied well this semester
9/ We have studied English for 4 years
10/ My best friend is very helpful and friendly
VII. Viết lại các câu sau sao cho nghĩa không đổi
1. "Can you carry these chairs into the house?"
Mrs Lan asked me ...........................................................................
2. "Please give me your book?"
He told me .......................................................................................
3. You shouldn't make noise in class."
The teacher said .............................................................................
4. "Can you help Tam with his English pronunciation?"
Mr Hung asked me ..........................................................................
5. My hobbies are playing sports and reading books
I love ................................................................................................
6. She was born on May 10th, 1996
Her birthday .....................................................................................
7. Nga must wash the dishes everyday
Nga has ...........................................................................................
8. We began to study English 4 years ago
We have ..........................................................................................
9. No one in class is as tall as Tam
Tam is the ........................................................................................
10. Women often did the house work without the help of modern equipment in the past In the past women used
VIII. Dùng từ gợi ý viết thành câu hoàn chỉnh
1. Thanh/ tall/ thin/ long/ straight/ hair
.........................................................................................................
2. His father/ generous/ friendly
.........................................................................................................
3. They/ going to/ have a meeting/ the weekend
.........................................................................................................
4. We/ must/not/ let/ children/ the kitchen/ because/ it/ dangerous place
.........................................................................................................
5. The Y&Y members/ going to/ take part/ recycling program/ save natural resources /and/ money/ the organization
.........................................................................................................
6. I/ a favor/ you help/ carry this bag?
.........................................................................................................
7. The town/ becoming/ beautiful
.........................................................................................................
8. My father/ used/ drive a car/ work/ now/ go/ bus
.........................................................................................................
9. I/ spend/ 2 hours/ day/ study English
.........................................................................................................
10. Alexander Graham Bell/ born/ Edinburgh/ March 3, 1847
.........................................................................................................
MC
11 tháng 11 2018
I. Điền hình thức đúng của động từ trong ngoặc:
1/ The Sun (rise) in the east and (set) in the west.
2/ My grandma (use) to tell me the folktales.
3/ She (not ) playing soccer.
4/ Where you (be) going to visit next summer?
I (visit) Hue.
5/ They (work) in this company for ten years.
6/ My mother has to (clean)the floor everyday.
7/ He (not write)to his friend since Monday.
8/ Students must (go) to school on time.
9/ I (get) a letter from my old friend yesterday
10/ Where he (use to)live before he moved here?
II. Hoàn thành các câu sau, dùng hình thức so sánh phù hợp:
1/ My house isn't as (big) her house.
2/ Milk is (expensive) than mineral water.
3/ This hotel is (cheap) in the town.
4/ She is wearing a hat (same) mine
5/ Ho Chi Minh City is (big) than Ha Noi.
6/ February is (short) of the year.
7/Life in the city is (busy).
8/ Nam is (intelligent) in my class.
9/ Lan is (pretty) as her sister.
10/ Her hobbies are (different) from yours
IV. Điền vào mỗi chỗ trống với một giới từ đúng
1/ They have built this house..............a long time.
2/ We have lived .....An Lao.....14 years.
3/ There are some books........the table........the right corner.......the room
4/ The course begins......January and ends .....April.
5/ I usually watch TV ......the evening.
6/ The stadium is in............of my house.
7/ He often gets up..........5.30...........the morning but.......Sunday morning he gets up late.
8/ English learners learn words ..............different ways
9/ Thank you very much ...........lending me your bike
10/ I got good grades.............English and Math last semester
11/ All students enjoy taking part ............outdoor activities
12. Should should learn ............heart these new words.
V. Hoàn thành các câu sau dùng đại từ phản thân phù hợp
1/ My brother can repair the bike ....................
2/ They have a great time. They really enjoy ......................
3/ Don't worry about us. We can look after ...................
4/ This exercise isn't difficult. Do it ...................
5/ She cut ....................
6/ I made this shirt ....................
VI. Đặt câu hỏi cho từ gạch chân:
1/ Hoa went to school late this morning because her bike broke down
2/ I have to tidy the living room everyday
3/ She'll be home after dinner
4/ Lan used to live on the farm when she was young
5/ My mother gave me a new bike on my 14th birthday
6/ Nam often walks to school
7/ I need to improve Math and English
8/ Nga studied well this semester
9/ We have studied English for 4 years
10/ My best friend is very helpful and friendly
VII. Viết lại các câu sau sao cho nghĩa không đổi
1. "Can you carry these chairs into the house?"
Mrs Lan asked me ...........................................................................
2. "Please give me your book?"
He told me .......................................................................................
3. You shouldn't make noise in class."
The teacher said .............................................................................
4. "Can you help Tam with his English pronunciation?"
Mr Hung asked me ..........................................................................
5. My hobbies are playing sports and reading books
I love ................................................................................................
6. She was born on May 10th, 1996
Her birthday .....................................................................................
7. Nga must wash the dishes everyday
Nga has ...........................................................................................
8. We began to study English 4 years ago
We have ..........................................................................................
9. No one in class is as tall as Tam
Tam is the ........................................................................................
10. Women often did the house work without the help of modern equipment in the past In the past women used
VIII. Dùng từ gợi ý viết thành câu hoàn chỉnh
1. Thanh/ tall/ thin/ long/ straight/ hair
.........................................................................................................
2. His father/ generous/ friendly
.........................................................................................................
3. They/ going to/ have a meeting/ the weekend
.........................................................................................................
4. We/ must/not/ let/ children/ the kitchen/ because/ it/ dangerous place
.........................................................................................................
5. The Y&Y members/ going to/ take part/ recycling program/ save natural resources /and/ money/ the organization
.........................................................................................................
6. I/ a favor/ you help/ carry this bag?
.........................................................................................................
7. The town/ becoming/ beautiful
.........................................................................................................
7 tháng 10 2021
\(a,=a^8-16\\ b,\left(a+c\right)^2-b^2=a^2+2ac+c^2-b^2\\ c,=\left(a^2-b^2\right)\left(a^2+b^2\right)\left(a^4+b^4\right)\\ =\left(a^4-b^4\right)\left(a^4+b^4\right)=a^8-b^8\\ d,=\left[\left(3x+y\right)-2\right]^2=\left(3x+y\right)^2-4\left(3x+y\right)+4\\ =9x^2+6xy+y^2-12x-4y+4\\ h,=x^3+64\\ e,=\left(2^4-1\right)\left(2^4+1\right)\left(2^8+1\right)\\ =\left(2^8-1\right)\left(2^8+1\right)=2^{16}-1=...\\ f,=\left(x+y-x+y\right)\left[\left(x+y\right)^2+\left(x+y\right)\left(x-y\right)+\left(x-y\right)^2\right]\\ =2y\left(x^2+2xy+y^2+x^2-y^2+x^2-2xy+y^2\right)\\ =2y\left(3x^2+y^2\right)\)
KT
12 tháng 2 2018
\(x^2\left(y-z\right)+y^2\left(z-x\right)+z^2\left(x-y\right)\)
\(=x^2\left(y-z\right)+y^2z-xy^2+xz^2-yz^2\)
\(=x^2\left(y-z\right)+yz\left(y-z\right)-x\left(y^2-z^2\right)\)
\(=\left(y-z\right)\left(x^2+yz-xy-xz\right)\)
\(=\left(y-z\right)\left[x\left(x-y\right)-z\left(x-y\right)\right]\)
\(=\left(y-z\right)\left(x-y\right)\left(x-z\right)\)
3 tháng 5 2019
Với lại, cho mình hỏi trường mấy bạn cho đề cương có bài tập ra sao? ví dụ bài tập nào khó của tin nè, hay là sinh trắc nghiệm ; văn có bài tập phần tiếng việt không? mà phần câu hỏi chốt cho mỗi văn bản là gì? viết đoạn văn ngắn thì mỗi văn bản có thể có những đề gì, ví dụ như là về tình yêu quê hương theo văn bản Quê hương(Tế Hanh)?
3 tháng 5 2019
ah, mà công nghệ thường là sẽ có một bài tập tính toán tiền điện hay gì đó thì mấy bạn có bài tập mẫu không, rồi hướng dẫn giải, càng nhiều càng tốt? Hơn nữa là lý thì có trắc nghiệm mấy bạn nghĩ câu nào dễ ra, câu nào khó, phần bài tập sẽ có những dạng chủ yếu nào, có câu giải thích hiện tượng gì đó, ví dụ như là tại sao thể tích hai hỗn hợp giảm khi trộn lẫn....?
TA
16 tháng 7 2017
a) \(\left(x+3\right)^3-x.\left(3x+1\right)^2+\left(2x+1\right).\left(4x^2-2x+1\right)-3x^2=54\)
\(\Leftrightarrow x^3+9x^2+27x+27-x.\left(9x^2+6x+1\right)+8x^3+1-3x^2=54\)
\(\Leftrightarrow x^3+9x^2+27x+27-9x^3-6x^2-x+8x^3+1-3x^2=54\)
\(\Leftrightarrow26x+28=54\Leftrightarrow26x=54-28\Leftrightarrow26x=26\Leftrightarrow x=1\)
Vậy nghiệm của phương trình là x=1
b) \(\left(x-3\right)^3-\left(x-3\right).\left(x^2+3x+9\right)+6.\left(x+1\right)^2+3x^2=-33\)
\(\Leftrightarrow x^3-9x^2+27x-27-\left(x^3-27\right)+6.\left(x^2+2x+1\right)+3x^2=-33\)
\(\Leftrightarrow x^3-9x^2+27x-27-x^3+27+6x^2+12x+6+3x^2=-33\)
\(\Leftrightarrow27x+12x+6=-33\Leftrightarrow39x=-33-6\Leftrightarrow39x=-39\Leftrightarrow x=-1\)
Vậy nghiệm của phương trình là x = -1
16 tháng 7 2017
Trần Anh: Hí hí =)) ÀI LỚP DIU CHIU CHIU CHÍU :3 CẢM ƠN PẠN NHIỀU NHÁ ;) ;) ;)
\(x^7+x^2+1=\left(x^7-x\right)+\left(x^2+x+1\right)\)
\(=x\left(x^6-1\right)+\left(x^2+x+1\right)\)
\(=x\left(x^3-1\right)\left(x^3+1\right)+\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)\left(x^3+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left[x\left(x-1\right)\left(x^3+1\right)+1\right]\)
\(=\left(x^2+x+1\right)\left[\left(x^2-x\right)\left(x^3+1\right)+1\right]\)
\(=\left(x^2+x+1\right)\left(x^5-x^4+x^2-x+1\right)\)
x7 + x2 + 1 = x7 + x6 - x6 + x5 - x5 + x4 - x4 +x3 - x3 +2x2 - x2 +x - x +1
=(x7 + x6 + x5) - (x6 +x5 +x4) + (x4 + x3 +x2) - (x3 +x2 + x) + (x2 + x +1)
=x5(x2 + x + 1) - x4(x2 + x + 1) +x2(x2 + x + 1) - x(x2 + x + 1) + (x2 + x + 1)
=(x2 + x + 1)(x5 - x4 +x2 -x +1)
/ mình chỉ cho bạn 1 phương pháp giản đơn giản nè: với 1 đa thức như đa thức trên thì bạn lấy đa thức đó chia cho đa thức x^2 + x + 1 hoặc x^2 - x + 1 . chia xong sẽ đc 1 đa thức (nếu dư thì không đc), bạn lấy đa thức thương nhân với x^2 + x + 1 hoặc x^2 - x + 1 sẽ đc đa thức ban đầu tách ra /