2will call-have

3saw-have told

4Thấy đã làm r =)

5get-will earn

6will-are

7would-saw

8would you do-lost nhé =)

2. will call-have

3. saw-have told

5. get-will earn

6. will-are

7. would-saw

8. would you do-lost

2 tá \(=24\)

Muốn mua 8 cái bút chì cần trả \(30000:24\times8=10000\left(VNĐ\right)\)

Số tiền phải trả khi mua 8 cái bút là:

\(30000:24\cdot8=10000\left(đồng\right)\)

1 tá=12:)
2 tá=24
Mua 1 cái thì phải trả:
       30 000 : 24 = 1 250(đồng)
Mua 8 cái thì phải trả:
       1 250 . 8 = 10 000(đồng)

Đ/s : 10 000 đồng:)

'x' là dấu nhân đúng không cậu?

9,14 x y = (5/7 - 3/14) x 4/7 

9,14 x y = 1/2 x 4/7

9,14 x y = 2/7

y = 2/7 : 9,14

y = 31,99

ko bé ơi

1) x = 23-20

  =>x= 3

2)32-x=18

=>x=32-18

=>x=14

3)/2x+1/=8

=>2x+1=8

hoặc 2x+1=-8

=>x=7/2

hoặc x=-9/2

1/ Ta có: \(x+20=-\left(-23\right)\)

        \(\Leftrightarrow x+20=23\)

        \(\Leftrightarrow x=3\)

Vậy...

2/ Ta có: \(15-x+17=-\left(-6\right)+\left|-12\right|\)

        \(\Leftrightarrow-x+32=18\)

         \(\Leftrightarrow x=32-18=14\)

Vậy...

3/ Ta có: \(3-\left|2x+1\right|=\left(-5\right)\)

       \(\Leftrightarrow\left|2x+1\right|=3-\left(-5\right)\)

       \(\Leftrightarrow\left|2x+1\right|=8\)

       \(\Leftrightarrow\orbr{\begin{cases}2x+1=8\\2x+1=-8\end{cases}}\)

       \(\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{2}\\x=-\frac{9}{2}\end{cases}}\)

Vậy...

\(\text{Phần a nên sửa đề thế này :}\) \(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)

\(\text{Giải :}\)

\(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)

\(=\frac{1}{7}\left(\frac{-3}{8}+\frac{-13}{8}\right)\)

\(=\frac{1}{7}.\left(-2\right)\)

\(=\frac{-2}{7}\)

\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)

\(=\frac{3}{5}.\left(\frac{1}{46}.13\right)-\frac{1}{10}.\frac{32}{46}\)

\(=\left(\frac{3}{5}.13\right).\frac{1}{46}-\left(\frac{1}{10}.32\right).\frac{1}{46}\)

\(=\frac{39}{5}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)

\(=\frac{78}{10}.\frac{1}{46}-\frac{32}{10}.\frac{1}{46}\)

\(=\left(\frac{78}{10}-\frac{32}{10}\right).\frac{1}{46}\)

\(=\frac{46}{10}.\frac{1}{46}\)

\(=\frac{1}{10}\)

1. Have you met

2. did

3. are you going

4. Do you watch

5. have you lived

6. Did you have

7. did she wear

8. do 

9. What have you done

10. Have you gone