使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a、b、c的值是
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![使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a、b、c的值是](/uploads/image/z/7207598-38-8.jpg?t=%E4%BD%BF%28ax%26%23178%3B-2xy%2By%26%23178%3B%29-%28-ax%26%23178%3B%2Bbxy%2B2y%26%23178%3B%29%3D6x%26%23178%3B-9xy%2Bcy%26%23178%3B%E6%88%90%E7%AB%8B%E7%9A%84a%E3%80%81b%E3%80%81c%E7%9A%84%E5%80%BC%E6%98%AF)
使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a、b、c的值是
使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a、b、c的值是
使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9xy+cy²成立的a、b、c的值是
(ax²-2xy+y²)-(-ax²+bxy+2y²)
=2ax²-(2+b)xy-y²
=6x²-9xy+cy²
故:2a=6;2+b=9;-1=c
故:a=3;b=7;c=-1