题目内容
因式分解
(1)-2x3+18x
(2)a2(x-y)+(y-x)
(1)-2x3+18x
(2)a2(x-y)+(y-x)
(1)-2x3+18x
=-(2x3-18x)
=-2x(x2-9)
=-2x(x-3)(x+3);
(2)a2(x-y)+(y-x)
=a2(x-y)-(x-y)
=(x-y)(a2-1)
=(x-y)(a-1)(a+1).
=-(2x3-18x)
=-2x(x2-9)
=-2x(x-3)(x+3);
(2)a2(x-y)+(y-x)
=a2(x-y)-(x-y)
=(x-y)(a2-1)
=(x-y)(a-1)(a+1).
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