1楼炫炫爸
(......)
发表于 2007-11-3 13:51
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[2(x^2)+ay-y-6]-[2b(x^2)-3x+5y-1]
=2(x^2)+ay-y-6-2b(x^2)+3x-5y+1
=(2-2b)(x^2)+3x+(a-6)y-5
代数值要与x无关,看来是困难的,ay改成ax就可以达到目的了
[2(x^2)+ay-y-6]-[2b(x^2)-3x+5y-1]
=2(x^2)+ay-y-6-2b(x^2)+3x-5y+1
=(2-2b)(x^2)+(a+3)x-6y-5
要与x无关,那么b=1,a=-3.