Question

Answer 1

a,x:1/4 =8

x       = 8x1/4

x      = 2

 

b, 3/5 : x = 7/9 + 2 

    3/5 : x = 25/9

            x = 25/9 x3/5

            x =     5/3

Answer 2

a \(x:\dfrac{1}{4}=8\)

\(x=8\times\dfrac{1}{4}\)

\(x=2\)

b\(\dfrac{3}{5}:x=\dfrac{7}{9}+2\)

\(\dfrac{3}{5}:x=\dfrac{25}{9}\)

\(x=\dfrac{25}{9}:\dfrac{3}{5}\)

\(x=\dfrac{125}{27}\)

c\(\dfrac{1}{2}\times x=\dfrac{3}{4}\)

\(x=\dfrac{3}{4}:\dfrac{1}{2}\)

\(x=\dfrac{3}{2}\)

d\(\dfrac{6}{7}-y=\dfrac{3}{5}\times\dfrac{1}{2}\)

\(\dfrac{6}{7}-y=\dfrac{3}{10}\)

\(y=\dfrac{6}{7}-\dfrac{3}{10}\)

\(y=\dfrac{39}{70}\)

Answer 3

Bài   :

a,x : 1/4=8

x=8.1/4

x=2

b,3/5 : x = 7/9 + 2

3/5 : x =7/9 + 18/9 

3/5 : x = 25/9

x = 3/5 : 25/9

x= 3/5 .9/25

x=27/125

c,1/2 x X =3/4

x = 3/4 : 1/2

x=3/4 .2

x=3/2

d,6/7 - y=3/5 x 1/2

6/7 - y=3/10

y=6/7-3/10

y=60/70-21/70

y=39/70