(a+b)2x2-2(a2-b2)xy+(a-b)2y2 查看更多

 

题目列表(包括答案和解析)

化简或求值
(1)2x2-2+3x-1-2x-x2;           
(2)a2-(3a2-b2)-3(a2-2b2
(3)已知:(x-3)2+|y+2|=0,求代数式2x2+(-x2-2xy+2y2)-2(x2-xy+2y2)的值.

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先化简,再求值:
(1)a2-(3a2-b2)-3(a2-2b2),其中a=1,b=-1;
(2)已知(x-3)2+|y+2|=0,求代数式2x2+(-x2-2xy+2y2)-2(x2-xy+2y2)的值.

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化简或求值:
(1)2x2-2+3x-1-2x-x2
(2)a2-(3a2-b2)-3(a2-2b2);
(3)已知:(x-3)2+|y+2|=0,求代数式2x2+(-x2-2xy+2y2)-2(x2-xy+y2)的值。

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化简或求值(本题满分16分,5+5+6):
(1)2x2-2+3x-1-2x-x2;           
(2)a2-(3a2-b2)-3(a2-2b2
(3)已知:(x-3)2+|y+2|=0,求代数式2x2+(-x2-2xy+2y2)-2(x2-xy+2y2)的值.

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化简或求值(本题满分16分,5+5+6):
(1)2x2-2+3x-1-2x-x2;           
(2)a2-(3a2-b2)-3(a2-2b2
(3)已知:(x-3)2+|y+2|=0,求代数式2x2+(-x2-2xy+2y2)-2(x2-xy+2y2)的值.

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