◆◇◆(X-2Y)(3X-7Y)^2+4(Y-2X)(X+Y)^2 如何分解因式?

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/18 15:15:03

◆◇◆(X-2Y)(3X-7Y)^2+4(Y-2X)(X+Y)^2 如何分解因式?
还有 a^2+4b^2+9c^2-4ab-12bc+6ac
怎么分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分分

原式=（X-2Y）（3X-7Y+2X+2Y）（3X-7Y-2X-2Y）
=5（X-2Y）（X-Y）（X-9Y）

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