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  【1.(b²+2a²)(2a²-b²)2.(4x²-4y²)(x²+y²)3.—(x-1)(x+1)-3(x+2)(x-2)4.(5y²+4x²)[4y²+(2x-y)(-2x-y)]】

  1.(b²+2a²)(2a²-b²)2.(4x²-4y²)(x²+y²)

  3.—(x-1)(x+1)-3(x+2)(x-2)4.(5y²+4x²)[4y²+(2x-y)(-2x-y)]

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2020-05-1500:37
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  1.(b²+2a²)(2a²-b²)=1.(2a²+b²)(2-b²)=4a四次方-b四次方2.(4x²-4y²)(x²+y²)=4(x²-y²)(x²+y²)=4(X四次方-y四次方)=4X...

2020-05-15 00:41:48
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