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x平方Y-XY平方+X立方-Y立方
人气:310 ℃ 时间:2020-03-18 10:17:51
解答
原式=XY(X-Y)+(X-Y)(X²+XY+Y²)
=(X-Y)(XY+X²+XY+Y²)
=(X-Y)(X²+2XY+Y²)
=(X-Y)(X+Y)²
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