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22 tháng 8 2020

D = (1 - 1/7).(1 - 2/7)...(1 - 7/7)...(1 - 10/7).

Do (1 - 7/7 = 0). => D = (1 - 1/7).(1 - 2/7). ... .0. ... .(1 - 10/7) = 0.

Vậy D = 0.

22 tháng 8 2020

\(3^5.4^5\)

\(=\left(3.4\right)^5\)

\(=12^5\)

22 tháng 8 2020

cảm ơn bn

22 tháng 8 2020

ta tìm BCNN của 2,5,6 

2=2

5=5

6=2.3

BCNN là 2.3.5=30

306090120150
295989119149

duy chỉ có 119 chia hết cho 7 

vậy số học sinh là 119 học sinh

22 tháng 8 2020

( hình mình vẽ bên dưới )

diện tích phần tăng thêm hay diện tích hình chữ nhât 2 là :                     1150  - 1035 =  115 ( m2 )

t  chiều rộng của hcn ban đầu chính bằng chiều dài của hcn thứ 2   và chiều rộng hcn thứ 2 là 5 (m )

vậy chiều dài hcn thứ 2 hay cr hình chữ nhật ban đầu là :                115 : 5 =  23 ( m )

chiều dài hcn ban đầu là :   1035 : 23 = 45 m 

chu vi hình chữ nhật là :                   ( 45 + 23 ) * 2 = 136 ( m )

đáp số : 136 m 

22 tháng 8 2020

Gọi chiều dài hcn ban đầu là x (m) (x>0). => Chiều rộng hcn là 1035/x (m) (1035/x < x).

Ta có: (x + 5).(1035/x) = 1150 (m^2). <=> 1035 + 5175/x = 1150. <=> 5175/x = 115. <=> 115.x = 5175. <=> x = 45. (tmđk x>0).

Vậy chiều dài hcn là 45 m. => Chiều rộng hcn là: 1035/x = 1035/45 = 23 (m).

Chu vi mảnh đất đó là: (45 + 23) x 2 = 136 (m).

Đáp số : 136 m.

22 tháng 8 2020

-3/x+1 . x-2/2 = (-3)(x-2)/ (x+1).2 = -3x+6/2x+2 nguyên 
<=> -3x+6 chia hết cho 2x+2
<=> 3x-6 chia hết cho 2x +2 
=> 2(3x-6)-3(2x+2) chia hết cho 2x +2
=> 6x-12-6x-6 chia hết cho 2x+2
=> 18 chia hết cho 2x +2 
bn tự giải típ nhé

22 tháng 8 2020

\(x^7.x.x^4=x^{7+1+4}=x^{12}\)

22 tháng 8 2020

Bg

Ta có: x7.x.x4 = x7 + 1 + 4 = x12

22 tháng 8 2020

\(3^4.3=3^5\)

22 tháng 8 2020

\(3^4.3\)

học tốt

V. Em hãy đọc kỹ đoạn văn sau, sử dụng các từ cho sau đây để hoàn thành các câu bên dưới dựa theo nội dung của bài:CousinsUncleAuntNephewsNieceGranddaughterGrandsonGrandparentssisterparents - in - lawMy familyMy name is Ellen and my husband’s name is Peter. We have got three children – two sons and a daughter. Our son’s names are Ian and Ben. They are twins, but they are not identical. Ian’s got dark hair, but Ben’s hair is fair. Our daughter’s...
Đọc tiếp

V. Em hãy đọc kỹ đoạn văn sau, sử dụng các từ cho sau đây để hoàn thành các câu bên dưới dựa theo nội dung của bài:

Cousins

Uncle

Aunt

Nephews

Niece

Granddaughter

Grandson

Grandparents

sister

parents - in - law

My family

My name is Ellen and my husband’s name is Peter. We have got three children – two sons and a daughter. Our son’s names are Ian and Ben. They are twins, but they are not identical. Ian’s got dark hair, but Ben’s hair is fair. Our daughter’s name is Tracy. She is eight years old. The boys are four. My father’s name is Frank and my mother’s name is Maureen. I’ve got two younger brothers, called Adam and Bobby. Adam is married. His wife’s name’s Ulrike. She is from Sweden and she’s got long, blond hair. They’re got a baby daughter called Anna. So my parents have gotj four grandchildren – two grandsons and two granddaughters. My husband’s got an oldder sister, but he hasn’t got any brothers. His sister’s name’s Millie. She is still single.

1. Ben is Frank’s ………………………

2. Tracy is Maureen’s …………………

3. Adam is Ian’s ……………………….

4. Millie is Tracy’s …………………….

5. Ian, Ben are Anna’s …………………

6. Frank and Maureen are Tracy’s …………………

7. Ian and Ben are Adam’s …………………

8. Tracy is Millie’s …………………

9. Frank and Maureen are Peter’s…………………

10. Millie is Ellen’s …………………

2
23 tháng 8 2020

1. Ben is Frank's grandson

2. Tracy is Maureen's granddaughter

3.  Adam is lan's uncle

4. Millie is Tracy's aunt

5. lan and Ben are Anna's cousin

6. Frank and Maureen is Tracy's grandparents

7. lan and Ben is Adam's nephew

8. Tracy is Millie's niece

9. Frank and Maureen is Peter's parent-in-law

10. Millie is Ellen's sister

My family

My name is Ellen and my husband’s name is Peter. We have got three children – two sons and a daughter. Our son’s names are Ian and Ben. They are twins, but they are not idenal. Ian’s got dark hair, but Ben’s hair is fair. Our daughter’s name is Tracy. She is eight years old. The boys are four. My father’s name is Frank and my mother’s name is Maureen. I’ve got two younger brothers, called Adam and Bobby. Adam is married. His wife’s name’s Ulrike. She is from Sweden and she’s got long, blond hair. They’re got a baby daughter called Anna. So my parents have gotj four grandchildren – two grandsons and two granddaughters. My husband’s got an oldder sister, but he hasn’t got any brothers. His sister’s name’s Millie. She is still single.

1. Ben is Frank’s grandson

2. Tracy is Maureen’s granddaughter

3. Adam is Ian’s uncle

4. Millie is Tracy’s aunt

5. Ian, Ben are Anna’s cousin

6. Frank and Maureen are Tracy’s grandparents

7. Ian and Ben are Adam’s nephew

8. Tracy is Millie’s niece

9. Frank and Maureen are Peter’s parents in law

10. Millie is Ellen’s sister