分解因式。
①3a²b-6ab²-ab②﹣2m²+12m-18③x²(y-2)+2-y④(x²-xy)²-(xy-y...
①3a²b-6ab²-ab
②﹣2m²+12m-18
③x²(y-2)+2-y
④(x²-xy)²-(xy-y²)² 展开
②﹣2m²+12m-18
③x²(y-2)+2-y
④(x²-xy)²-(xy-y²)² 展开
展开全部
①3a²b-6ab²-ab
解:原式 = ab(3a-6b-1)
②﹣2m²+12m-18
解:原式 = - 2(m²-6m+9)
= - 2(m-3)²
③x²(y-2)+2-y
解:原式 = (y-2)(x² -1)
= (y-2)(x+1)(x-1)
④(x²-xy)²-(xy-y²)²
解:原式 = (x²-xy + xy-y²)(x²-xy - xy + y²)
= (x²-y²)(x²-2xy + y²)
= (x+y)(x-y)(x-y)²
= (x+y)(x-y)³
解:原式 = ab(3a-6b-1)
②﹣2m²+12m-18
解:原式 = - 2(m²-6m+9)
= - 2(m-3)²
③x²(y-2)+2-y
解:原式 = (y-2)(x² -1)
= (y-2)(x+1)(x-1)
④(x²-xy)²-(xy-y²)²
解:原式 = (x²-xy + xy-y²)(x²-xy - xy + y²)
= (x²-y²)(x²-2xy + y²)
= (x+y)(x-y)(x-y)²
= (x+y)(x-y)³
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