Question

[anhmiing]

25x² -y² +4y-4

x+2y-xy-2

a²+b²-x²-y²+2ab-2xy

giup minh that nhanh voi

Answer 1

[Lê Tài Bảo Châu]

a) \(25x^2-y^2+4y-4\)

\(=\left(5x\right)^2-\left(y-2\right)^2\)

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

Answer 2

[Lê Tài Bảo Châu]

b) \(x+2y-xy-2\)

\(=\left(x-xy\right)+\left(2y-2\right)\)

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

\(=x\left(1-y\right)-2\left(1-y\right)\)

\(=\left(1-y\right)\left(x-2\right)\)