Question

y+y:2+y:4=42

Answer 1

y+y:2+y:4=42
yx1+yx1/2+yx1/4=42
=> y x(1+1/2+1/4)=42
=>y x7/4=42
=>y=42:7/4
=>y=24
Vậy y=24

Answer 2

Answer 3

`y + y : 2 + y : 4=42`

`=> y xx 1 + y xx 1/2 + y xx 1/4=42`

`=> y xx (1 +1/2 +1/4)=42`

`=> y xx 7/4 =42`

`=> y= 42 : 7/4`

`=>y= 42 xx 4/7`

`=>y=24`

`@ l`