Question

x2−y2−4x+4y＝0 因式分解怎么分？求过程不是答案。

x2表示x的平方，y2表示y的平方

Answer 1

原式=(x²-y²)-4(x-y)=(x-y)(x+y)-4(x-y)=(x-y)(x+y+4)

Answer 2

x²-y²-4x+4y
=(x²-y²)-4(x-y)
=(x+y)(x-y)-4(x-y)
=(x-y)(x+y-4)