. dùng máy tính là ra mà bạn =))

\(x^2-\left[6^2-\left(8^2-9.7\right)^3-7.5\right]^3=89-102\)

\(x^2\left[36-\left(64-63\right)^3-35\right]^3=-13\)

\(x^2-0^3=-13\)

\(x^2=-13\)( Vô lý)

=> x không xác định

Tổng A có số số hạng là : ( 1000 - 1 ) : 1 + 1 = 1000 ( số )

suy ra A bằng : ( 1000 + 1 ) . 1000 : 2 = 500500

chỗ B mk ko bt tự nhiên nhảy đâu ra 74 thì chịu 

Tổng C có số số hạng là : ( 1001 - 1 ) . 2 + 1 = 2001 ( số )

suy ra C bằng : ( 1001 + 1 ) . 2001 : 2 = 1 002 501

kb vs mk nhá

Công thức:

( Số cuối - số đầu ) : khoảng cách + 1

a)y=5/6

b)y=11/4

\(a\left(\frac{1}{2}-\frac{1}{4}+....+\frac{1}{8}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\left(\frac{1}{2}-\frac{1}{10}\right).y=\frac{1}{3}\)

\(\frac{2}{5}.y=\frac{1}{3}\)

      \(y=\frac{1}{3}:\frac{2}{5}\)

     \(y=\frac{5}{6}\)

\(b,\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+....+\frac{1}{9}-\frac{1}{11}\right).y=\frac{2}{3}\)

     \(\left(\frac{1}{1}-\frac{1}{11}\right).y=\frac{2}{3}\)

      \(\frac{10}{11}.y=\frac{2}{3}\)

              \(y=\frac{2}{3}:\frac{10}{11}\)

               \(y=\frac{22}{30}\)

dễ

hết

chỗ

chê

\(1-\)\(a,\frac{7}{8}-\frac{2}{3}=\frac{21}{24}-\frac{16}{24}=\frac{5}{24}\)

\(b,\frac{7}{8}-\frac{2}{3}\times\frac{3}{4}=\frac{7}{8}-\frac{1}{2}=\frac{7}{8}-\frac{4}{8}=\frac{3}{8}\)

\(2-\)\(a,\frac{5}{8}-x=\frac{5}{9}\)

\(x=\frac{5}{8}-\frac{5}{9}\)

\(x=\frac{5}{72}\)

\(b,\frac{3}{4}:x=\frac{2}{5}\)

\(x=\frac{3}{4}:\frac{2}{5}\)

\(x=\frac{15}{8}\)

1, Tính:

\(\frac{7}{8}\) - \(\frac{2}{3}\) = \(\frac{21}{24}\) - \(\frac{16}{24}\) = \(\frac{5}{24}\)

\(\frac{7}{8}\) - \(\frac{2}{3}\) x \(\frac{3}{4}\) = \(\frac{7}{8}\) - \(\frac{1}{2}\) = \(\frac{7}{8}\) - \(\frac{4}{8}\) = \(\frac{3}{8}\)

2, Tìm x

\(\frac{5}{8}\)- x = \(\frac{5}{9}\)

           x = \(\frac{5}{8}\)- \(\frac{5}{9}\)

           x = \(\frac{5}{72}\)

\(\frac{3}{4}\): x = \(\frac{2}{5}\)

           x = \(\frac{3}{4}\) : \(\frac{2}{5}\)

           x = \(\frac{15}{8}\)

1. may / it / rain / tomorrow

it may rain tomorrow

2. you / do / could / a / me / favor

could you do me a favor?

3. you / could / form / for / me / fill / in / this?

could you fill in this form for me?

4. we / should/do/what/to/help/street/children?

what should we do to help street children?

5. out/this/please/application/fill/form?

please fill out this application form.

6. suggest/I/we/for/the/poor/should/funds/raise

I suggest we should raise funds for the poor

7. by/elderly/can/them/shopping/people/we/for/doing/help

we can help elderly people by doing shopping for them

8. carry/my/bags/can/me/you/help?

can you help me carry my bags?

1. may / it / rain / tomorrow

=> It may rain tomorrow.

2. you / do / could / a / me / favor

=> Could you do me a favor?

3. you / could / form / for / me / fill / in / this?

=> Could you fill in this form for me?

4. we / should/do/what/to/help/street/children?

=> What should we do to help street children?

5. out/this/please/application/fill/form?

=> Please fill out this application form.

6. suggest/I/we/for/the/poor/should/funds/raise

=> I suggest we should raise funds for the poor.

7. by/elderly/can/them/shopping/people/we/for/doing/help

=> We can help elderly people by doing shopping for them.

8. carry/my/bags/can/me/you/help?

=> Can you help me carry my bags?

1, It may rain tomorrow .

2, Could you do me a favor ?

3, Could you fill in this form for me ?

4,What should we do to help street children ?

5, Please fill out this appliancation form

6,I suggest we should raise fund for the poor .

7,We can help ealderly peaople by doing shopping for them

8,Can you help me carry my bags ?

Chúc bạn học tốt

4 + x = 7 - 2x

4 + x + 2x = 7

4 + 3x = 7

3x = 7 - 4

3x = 3

x = 3 : 3

x =1

5 + x = 8,3 + 4,7 - x

5 + x + x = 8,3 + 4,7

5 + 2x = 13

2x = 13 -  5

2x = 8

x = 8 : 2

x= 4

Làm đc thì mình k cho 5 cái luôn

Vì bạn không rõ ai hỏi ai nên mình sẽ lấy mặc định là A asked B nhé

1. " Please take these books to my classroom "

=> A asked B to take these books to A's classroom.

2. " Can you buy me some soap on your way home ? "

=> A asked B if B could buy A some soap on B's way home.

3. " Please turn on the radio for me ? "

=> A asked B to turn on the radio for A

4. " Could you do the washing up for me ? "

=> A asked B if B could do the washing up for A

5. " Can you make me some cool drink ? "

=> A asked B if B could make A some cool drink

6. " Please clean up the room before you leave "

=> A asked B to clean up the room before B leave.

7. " Don't eat green fruit "

=> A asked B not to eat green fruit.

8. " Don't stay up late "

=> A asked B not to stay up late.

9. " Can you help us with these new words ? "

=> A asked B if B could help them with those new words

10. " Could you lend me your dictionary ? "

=> A asked B if B could lend A B's dictionary.

\(\dfrac{6}{13}.\dfrac{8}{7}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{6}{13}.\left(\dfrac{8}{7}+\dfrac{9}{7}\right)-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{6}{13}.\dfrac{17}{7}-\dfrac{3}{13}.\dfrac{6}{7}=\dfrac{102}{91}-\dfrac{18}{91}=\dfrac{12}{13}\)

a) 60 - 3 ( x - 2 ) = 51

=> 3 (x - 2) = 60 - 51 = 9

=> x - 2 = 9 : 3 = 3

=> x = 3 = 2 = 5 

b) 4x - 20 = 2^5 : 2^2

=> 4x - 20 = 8

=> 4x = 8 + 20 = 28

=> x = 28 : 4 = 7

c) 48751 - ( 10425 + x ) = 382^8 : 12

đề có sai ko ?

d) ( 2367 - x ) - ( 2^10 - 7 ) = 15^2 - 20 

=> 2367 - x - 2^10 + 7 = 205

=> -x = 205 - 7 + 2¹⁰ - 2367 = -1145

=> x = 1145

câu D của bạn trần như sai rồi phải là 1146 mới là đáp án đúng