Question

y + y x 1/3 : 2/9 + y : 2/7 = 420
giải giúp e ạ

Answer 1

=>y+yx1/3x9/2+7/2y=420

=>6y=420

=>y=70

Answer 2

\(y+y\times\dfrac{1}{3}\times\dfrac{9}{2}+y\times\dfrac{7}{2}=420\) 

\(y\left(1+\dfrac{1}{3}\times\dfrac{9}{2}+\dfrac{7}{2}\right)=420\) 

\(6y=420\) 

\(y=420:6=70\)

Answer 3

`y + y xx 1/3 : 2/9 + y : 2/7 = 420`

`y + y xx 1/3 xx 9/2 + y xx 7/2=420`

`y + y xx 3/2 + y xx 7/2 = 420`

`y xx 1 + y xx 3/2 + y xx 7/2 = 420`

`y xx (1 + 3/2 + 7/2)=420`

`y xx 6=420`

`y=420:6`

`y=70`