Question

Câu 8: ( 1 điểm ) Tìm x, biết:

                                a) 3/5: x = 3                                              b)x/5:3/8=8/5

Answer 1

a) \(\dfrac{3}{5}:x=3\)

\(x=\dfrac{3}{5}:3\)

\(x=\dfrac{3}{5}\times\dfrac{1}{3}\)

\(x=\dfrac{1}{5}\)

b) \(\dfrac{x}{5}:\dfrac{3}{8}=\dfrac{8}{5}\)

\(\dfrac{x}{5}=\dfrac{8}{5}\times\dfrac{3}{8}\)

\(\dfrac{x}{5}=\dfrac{3}{5}\)

\(=>x=3\)

Answer 2

a,x=3/5:3/

x=3/5.1/3

x=1/5

b,x/5=8/5.3/8

x/5=3/5

=> x=3

Answer 3

`a)3/5:x=3`

`x=3/5:3=3/5xx1/3`

`x=1/5`

`b)x/5:3/8=8/5`

`x/5=8/5xx3/8`

`x/5=3/5`

`x=3`

Answer 4

Câu 8: ( 1 điểm ) Tìm x, biết:

a) 3/5 : x = 3

x = 3/5 : 3

x = 1/5

b) x/5 : 3/8 = 8/5

x/5 = 8/5 x 3/8

8x = 64 x 3/8

8x = 24

x = 24 : 8

x = 3.