Question

1.Tìm y, biết: a) y × 2/5 + y × 3/5 = 5/7 b) y × 7/2 - y × 3/2 = 3/4

Answer 1

a) y × 2/5 + y × 3/5 = 5/7 

y x ( 2/5 + 3/5) = 5/7

y x 5/5 = 5/7

y x 1 = 5/7

y = 5/7 : 1

y = 5/7

 

b) y × 7/2 - y × 3/2 = 3/4

y x ( 7/2 - 3/2) = 3/4

y x 4/2 = 3/4

y x 2 = 3/4

y = 3/4 : 2

y = 3/4 x 1/2

y = 3/8

Answer 2

`a,yxx(2/5+3/5)=5/7`

`y xx1=5/7`

`y=5/7:1`

`y=5/7`

`b,y xx(7/2-3/2)=3/4`

`y xx2=3/4`

`y =3/4:2`

`y=3/2`