(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В

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(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В(y-x)²-(x+y)(x-y)=(x-y)

(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В
(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В

(y-x)虏-(x+y)(x-y)锲犲纺鍒呜В
(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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(y-x)^2-(x+y)(x-y)
=(y-x)^2+(x+y)(y-x)
=(y-x)(y-x+x+y)
=(y-x)(2y)
=2y(y-x)