Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: =-5/7(2/11+9/11)+12/7
=12/7-5/7
=7/7=1
b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)
c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)
=1-1+2/11
=2/11
d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)
=1+1-16/7
=-2/7
e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)
tìm từ khắc với từ còn lại:
a) 1.fish 2.listen 3.time
b) 1.do 2. to 3. movies 4.go
c) 1.I 2. like 3.milk 4.die
d) 1. cold 2.close 3.hot 4.slow
e) 1.sea 2. tea 3 teather 4 weather
f) 1.chest 2.hand 3.head 4.toe 5.finger 6.big 7.noes
g) 1. table 2.chair 3 desk 4.couch 5.bench 6.hand
h)1.father 2.mother 3 sister 4.brother 5. people 6. uncle
i) 1. come 2. sit 3.desk 4.open 5. close 6. read 7.write 8. travel
a) 1.fish 2.listen 3.time
b) 1.do 2. to 3. movies 4.go
c) 1.I 2. like 3.milk 4.die
d) 1. cold 2.close 3.hot 4.slow
e) 1.sea 2. tea 3 teather 4 weather
f) 1.chest 2.hand 3.head 4.toe 5.finger 6.big 7.noes
g) 1. table 2.chair 3 desk 4.couch 5.bench 6.hand
h)1.father 2.mother 3 sister 4.brother 5. people 6. uncle
i) 1. come 2. sit 3.desk 4.open 5. close 6. read 7.write 8. travel
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\\ x=\dfrac{1}{7}+\dfrac{3}{4}\\ x=\dfrac{25}{28}\\ b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\\ x+\dfrac{7}{5}=\dfrac{1}{6}\\ x=\dfrac{1}{6}-\dfrac{7}{5}\\ x=\dfrac{-37}{30}\\ c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\\ \dfrac{-1}{35}=\dfrac{x}{70}\\ \dfrac{-2}{70}=\dfrac{x}{70}\\ x=-2\\ d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\\ \dfrac{7}{8}.x=\dfrac{2}{9}-1\\ \dfrac{7}{8}.x=\dfrac{-7}{9}\\ x=\dfrac{-7}{9}:\dfrac{7}{8}\\ x=\dfrac{-8}{9}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\)
\(\Rightarrow x=\dfrac{1}{7}+\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{25}{28}\)
\(b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\)
\(\Rightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\)
\(\Rightarrow x=\dfrac{1}{6}-\dfrac{7}{5}\)
\(\Rightarrow x=-\dfrac{37}{30}\)
\(c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\)
\(\Rightarrow\dfrac{-1}{35}=\dfrac{x}{70}\)
\(\Rightarrow35x=-70\)
\(\Rightarrow x=-2\)
\(d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\)
\(\Rightarrow\dfrac{7}{8}x=\dfrac{2}{9}-1\)
\(\Rightarrow\dfrac{7}{8}x=-\dfrac{7}{9}\)
\(\Rightarrow x=-\dfrac{8}{9}\)
Em hãy viết danh từ số nhiều của những từ sau
1.Factory 2.Foot 3.Tomato 4. Bookshelf 5.Glass
1...........factories............. 2...........foots................. 3..............tomatoes................... 4.............bookshelves................ 5............glasses..............
a) −512−512 . 419419 +−712−712 . 419419 -40574057 Đầu tiên, chúng ta tính toán phép nhân: −512 x 419419 = -214,748,928 −712 x 419419 = -298,238,328
Tiếp theo, chúng ta tính tổng của hai kết quả: -214,748,928 + -298,238,328 = -513,987,256
Cuối cùng, chúng ta trừ đi 40574057: -513,987,256 - 40574057 = -554,561,313
Vậy kết quả của phép tính a là -554,561,313.
b) 1313 . 4545 + 1313.1.1515 + ( −32−32 )^2 Đầu tiên, chúng ta tính toán phép nhân: 1313 x 4545 = 5,964,385 1313 x 1.1515 = 1,511.195 −32 x −32 = 1,024
Tiếp theo, chúng ta tính tổng của ba kết quả: 5,964,385 + 1,511.195 + 1,024 = 5,966,920.195
Vậy kết quả của phép tính b là 5,966,920.195.
Đặt câu hỏi với how many và trả lời
1. Clock / living room / 1
-> How many clock are ther in the living room ?
-> There is one clock in the living room
2. Student / classroom / 48
-> How many students are there in my classroom ?
-> There are 48 students in the classroom
3. Couch / house / 3
-> How many couches are ther in my house ?
-> There are 3 couches in my house
4. Person / family / 5
-> How many people are there in my family ?
-> There are 5 people in my family
5. Lamp / room / 1
-> How many lamp are there in her room ?
-> There is 1 lamp in her room
6. Bench / classroom / 24
-> How many benches are ther in his classroom ?
-> There are 24 benches in his classroom
7. Bookshelf / room / 2
-> How many bookshelves are there in their room ?
-> There are 2 bookshelves in their room
8. teacher /school /50
-> How many teachers are there in my school ?
-> There are 50 teachers my my school
Đặt câu hỏi với how many và trả lời:
1. Clock / living room / 1
=> How many clocks are there in the living room?
=> There is one clock in the living room.
2. Student / classroom / 48
=> How many students are there in my classroom?
=> There are 48 students in the classroom.
3. Couch / house / 3
=> How many couches are there in my house?
=> There are 3 couches in my house.
4. Person / family / 5
=> How many people are there in my family?
=> There are 5 people in my family.
5. Lamp / room / 1
=> How many lamps are there in her room?
=> There is 1 lamp in her room.
6. Bench / classroom / 24
=> How many benches are there in his classroom?
=> There are 24 benches in his classroom.
7. Bookshelf / room / 2
=> How many bookshelves are there in their room?
=> There are 2 bookshelves in their room.
8. teacher /school /50
=> How many teachers are there in my school?
=> There are 50 teachers my my school.
match one verbs in a with words /phrases in b. write the answer column
a. b. an swers
1. take 2. care h.of old people
3. fix c.a bike
4. cook g. meals
5.fill f. in a form
6. raise a. funds
7. tidy d. a room
8. plant b. flowers
1,take,2,care - h,for old people
3, fix -c.a,bike
4, cook - g. meal
5, fill - f, in a form
6, raise - a,funds
7,tidy- a,room
8,plant - b,flower
Chúc bạn học tốt 
\(A=\left(2+\dfrac{1}{5}-\dfrac{2}{3}\right)+\left(3-\dfrac{4}{5}+\dfrac{2}{3}\right)-\left(1+\dfrac{7}{5}-\dfrac{3}{5}\right)\)
\(A=2+\dfrac{1}{5}-\dfrac{2}{3}+3-\dfrac{4}{5}+\dfrac{2}{3}-1-\dfrac{7}{5}+\dfrac{3}{5}\)
\(A=\left(2+3-1\right)+\left(\dfrac{1}{5}-\dfrac{4}{5}-\dfrac{7}{5}+\dfrac{3}{5}\right)+\left(-\dfrac{2}{3}+\dfrac{2}{3}\right)\)
\(A=4+\dfrac{-7}{5}+0\)
\(A=\dfrac{20}{5}+\dfrac{-7}{5}=\dfrac{13}{5}\)
Tính giá trị của biểu thức
A=(2+1/5-2/3)+ (3-4/5+ 2/3)-(1+7/5-3/5)
= (2 + ( -7/5 ) + ( 3 - 22/5) - (1 + 4/5)
= 3/5 - 7/5 + 9/5
= 5/5
= 1