Question

[Phan Ngọc Linh]

yx5+y:0,25=81

yx3+y:0,2=64

Answer 1

[Minh Tú sét boi]

\(y\text{×}5+y:0,25=81\)

\(y\text{×}5+y\text{×}4=81\)

\(y\text{×}\left(5+4\right)=81\)

\(y\text{×}9=81\)

\(y=81:9\)

\(y=9\)

\(y\text{×}3+y:0,2=64\)

\(y\text{×}3+y\text{×}5=64\)

\(y\text{×}\left(3+5\right)=64\)

\(y\text{×}8=64\)

\(y=64:8\)

\(y=8\)