(x+2y)(x-2y)*(x²-4y²)
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(x+2y)(x-2y)*(x²-4y²)
计算:(x+2y)(x-2y)*(x²-4y²)=(x²-4y²)²=(x²)²-8x²y²+16(y²)² (工具不好)
应当是:(x+2y)(x-2y)*(x²+4y²)==(x²)²-16(y²)²
应当是:(x+2y)(x-2y)*(x²+4y²)==(x²)²-16(y²)²
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(x+2y)(x-2y)*(x²-4y²)
(x-2y)(x²-4y²)(x+2y)=什么?