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分解因式:3a(x-y)m的二次方+12a(y-x)n的二次方
人气:417 ℃ 时间:2019-08-20 05:37:13
解答
3a(x-y)m²+12a(y-x)n²
=3a(x-y)m²-12a(x-y)n²
=3a(x-y)(m²-4n²)
=3a(x-y)[m²-(2n)²]
=3a(x-y)(m+2n)(m-2n)
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