(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В

Question

(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В

Answer 1

(y-x)²-(x+y)(x-y)
=(x-y)²-(x+y)(x-y)
=(x-y)[(x-y)-(x+y)]
=(x-y)(-2y)
=-2y(x-y)

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