计算 help(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)(2) (2x-7)(x+7)-(2x-3)(2x+3)化简求值(a-根号3)(a+根号3)-a(a-6),其中a=1/2
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计算 help(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)(2) (2x-7)(x+7)-(2x-3)(2x+3)化简求值(a-根号3)(a+根号3)-a(a-6),其中a=1/2
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