原帖由 mk311111 於 7/1/2009 05:38 PM 發表
(a) (2x - 3)y + xy =y(2x - 3+x)=y(3x-3)+3y(x-1)
(b) (6x - 5)(x - y) - x(x - y)=(x - y)(6x - 5-x)=(x - y)(5x - 5)=5(x - y)(x - 1)
(c) (2x + 3)(x - y) + (1 - x)(y - x)=(2x + 3)(x - y) - (1 - x)( x - ...
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