Question

yxy+1=82

 

Answer 1

=>y^2=81

=>y=9 hoặc y=-9

Answer 2

\(y\times y+1=82\)

\(y\times y=81\)

\(=>y=9\)

Answer 3

\(yxy+1=82\)

\(\Rightarrow yxy=82-1\)

\(\Rightarrow yxy=81\)

Ta có: \(3\times9\times3\) 

Vậy:  \(y=3\)

\(x=9\)