问题标题：
因式分解（简单）(1822:16:52)-2X+6X2 -3X3                          
问题描述：
因式分解（简单）(1822:16:52)
-2X+6X2 -3X3 X2(X-Y)+(Y-X)Y2
黄辉扬回答：
-2X+6X^2-3X^3
=X(-2X+6X^2-3X^3)
=X(-2+6X-3X^2)
=-X(3X^2-6X+2)
X^2(X-Y)+(Y-X)Y^2
=X^2(X-Y)-(X-Y)Y^2
=(X-Y)(X^2-Y^2)
=(X-Y)(X-Y)(X+Y)
=(X-Y)^2(X+Y)
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