计算:(x+7)(x-6)-(x-2)(x+2)
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计算:(x+7)(x-6)-(x-2)(x+2)
计算:(x+7)(x-6)-(x-2)(x+2)
计算:(x+7)(x-6)-(x-2)(x+2)
计算:(x+7)(x-6)-(x-2)(x+2)
=x平方一6x+7x—42一(x平方一4)
=x平方+x—42—x平方+4
=x—38
原式=x^2-6x+7x-42-x^2+4=x-38
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