Question

Tìm \(x\):

a)\(x\times\dfrac{4}{5}:2=\dfrac{6}{7}\)                 b)\(\dfrac{6}{5}:x:\dfrac{5}{4}=\dfrac{10}{15}\)

Answer 1

`x xx4/5 :2=6/7`

`x xx 4/5xx1/2=6/7`

`x xx2/5=6/7`

`x=6/7:2/5`

`x=6/7xx5/2`

`x=15/7`

b)

`6/5:x:5/4=10/15`

`6/5:x xx4/5=2/3`

`6/5:x=2/3:4/5`

`6/5:x=2/3xx5/4`

`6/5:x=5/6`

`x=6/5:5/6`

`x=6/5xx6/5`

`x=36/25`

Answer 2

a) x × 4/5 : 2 = 6/7

x × 4/5 = 6/7 × 2

x × 4/5 = 12/7

x = 12/7 : 4/5

x = 15/7

b) 6/5 : x : 5/4 = 10/15

6/5 : x : 5/4 = 2/3

6/5 : x = 2/3 × 5/4

6/5 : x = 5/6

x = 6/5 : 5/6

x = 36/25