1/2x(x+4y)+2y平方
因式分解
人气：275 ℃ 时间：2020-02-01 00:48:56
解答
(1/2)x(x+4y)+2y²
=(1/2)x²+2xy+2y²
=(1/2)[x²+4xy+(2y)²]
=(1/2)(x+2y)²
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