Question

(2x+2y)分之(x-y)-(x的平方-y的平方)分之(x平方+y平方)=

Answer 1

(2x+2y)分之(x-y)-(x的平方-y的平方)分之(x平方+y平方)

=(2x+2y)分之(x-y)-[(x+y)(x-y)]分之(x²+y²)

=[2(x+y)(x-y)]分之(x-y)²-[2(x+y)(x-y)]分之[2(x²+y²)]

=[2(x+y)(x-y)]分之[(x²-2xy+y²)-(2x²+2y²)]

=[2(x+y)(x-y)]分之[-(x²+2xy+y²)]

=[2(x+y)(x-y)]分之[-(x+y)²]

=-[2(x-y)]分之(x+y)