因式分解①16x^2y^2-9 ②-24x^2y-12xy^2+28^3 ③（2a+x）^2-（a-x）^2 ④-4x+1+4x^2 ⑤2xy-y^2-x^2
因式分解①16x^2y^2-9 ②-24x^2y-12xy^2+28^3 ③（2a+x）^2-（a-x）^2 ④-4x+1+4x^2 ⑤2xy-y^2-x^2
人气：495 ℃ 时间：2020-03-26 18:50:02
解答
①16x^2y^2-9 =(4xy-3)(4xy+3)②-24x^2y-12xy^2+28^3有问题③（2a+x）^2-（a-x）^2 =(2a+x+a-x)(2a+x-a+x)=(3a)(a+2x)=3a(a+2x)④-4x+1+4x^2=4x^2-4x+1=(2x-1)^2⑤2xy-y^2-x^2=-(x^2-2xy+y^2)=-(x-y)^2
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