计算题4(a-b)²-(2a+b)(-b+2a)(x+2y-6)(x-2y+6)999²-1002×9982011+2011²-2012²(2+1)(2²+1)·…·(2的三十二次方+1)分解因式(x+3)(x+2)+x²-9(x-y)³+9(x-y)-6(x-y)²2(a²-2a+1)-b(a-1)(a²+b²-c²
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