Question

Tìm x:

7/5-*=3/10

4/7:*=5/15

*=nhân

Answer 1

`7/5 - x = 3/10`

`x= 7/5 - 3/10`

`x=14/10 - 3/10`

`x=11/10`

`4/7 : x= 5/15`

`x= 4/7 : 1/3`

`x= 4/7 xx 3`

`x=12/7`

Answer 2

\(\dfrac{7}{5}-x=\dfrac{3}{10}\\ x=\dfrac{7}{5}-\dfrac{3}{10}\\ x=\dfrac{14}{10}-\dfrac{3}{10}=\dfrac{11}{10}\\ \dfrac{4}{7}:x=\dfrac{5}{15}\\ x=\dfrac{4}{7}:\dfrac{5}{15}\\ x=\dfrac{12}{7}\)

Answer 3

`7/5-x=3/10`

`x=7/5-3/10`

`x=14/10-3/10`

`x=11/10`

`---------------------------`

`4/7:x=5/15`

`4/7:x=1/3`

`x=4/7:1/3`

`x=4/7xx3`

`x=12/7`

Answer 4

Answer 5

`7/5 - * = 3/10`

`=>   *   = 7/5 - 3/10`

`=>   *    = 11/10`

_____________________

\(\dfrac{4}{7}:\) * = \(\dfrac{5}{15}\)

\(=>\) * = \(\dfrac{4}{7}:\dfrac{5}{15}\)

\(=>\)*   = \(\dfrac{12}{7}\)