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解=a*a-ab+ab-b*b-a*a+ab+2ab-2*b*b =(a的平方-a的平方)+(-ab+ab+2ab+ab)+(-b的平方-2(b)的平方=3ab-3(b)的平方=3*2*(-1)-3*(-1)的平方=6*(-1)-3 =-6-3 =-9
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