Question

Answer 1

bạn đăng tách ra nhé 

a, \(x=\dfrac{4}{7}:\dfrac{4}{5}=\dfrac{5}{7}\)

b, \(\dfrac{2}{5}x=0\Leftrightarrow x=0\)

c, \(x=\dfrac{2}{5}:\left(-\dfrac{1}{4}\right)=-\dfrac{8}{5}\)

d, \(\dfrac{5}{7}:x=1\Leftrightarrow x=\dfrac{5}{7}\)

Answer 2

`3/4:x=1/2`

`x=3/4:1/2`

`x=3/4 . 2

`x= 3/2`

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`3/5x-1/5=4/5`

`3/5 x =4/5+1/5`

`3/5 x = 1`

`x=1:3/5`

`x=1 . 5/3`

`x=5/3`

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`x:4/7 = -5/2`

`x=-5/2 . 4/7`

`x=-10/7`

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`5/7 x = 9/8 - 0,125`

`5/7 x = 9/8 -1/8`

`5/7x = 1`

`x=1:5/7`

`x=1 . 7/5`

`x=7/5`