Question

Tìm x, y € Z biết 

a) xy+12=x+y

b) x(y+1)=2y+5

Ai nhanh mik tick 

Answer 1

\(xy+12=x+y\)

<=> \(xy-x-y+12=0\)

<=> \(x\left(y-1\right)-\left(y-1\right)+11=0\)

<=> \(\left(x-1\right)\left(y-1\right)=-11\)

làm nốt nha

\(x\left(y+1\right)=2y+5\)

<=> \(x\left(y+1\right)-2y-5=0\)

<=> \(x\left(y+1\right)-2\left(y+1\right)-3=0\)

<=> \(\left(x-2\right)\left(y+1\right)=3\)

làm nốt nha