因式分解①16x^2y^2-9 ②-24x^2y-12xy^2+28^3 ③(2a+x)^2-(a-x)^2 ④-4x+
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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
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
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)^2
⑤2xy-y^2-x^2
=-(x^2-2xy+y^2)
=-(x-y)^2
=(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)^2
⑤2xy-y^2-x^2
=-(x^2-2xy+y^2)
=-(x-y)^2
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