题目内容
因式分
(1)(3a-2b)2-(2a+3b)2;
(2)-xy+2x2y+x3y.
(1)(3a-2b)2-(2a+3b)2;
(2)-xy+2x2y+x3y.
(1)(3a-2b)2-(2a+3b)2
=(3a-2b+2a+3b)(3a-2b-2a-3b)
=(5a+b)(a-5b);
(2)-xy+2x2y+x3y=-xy(1-2x-x2).
=(3a-2b+2a+3b)(3a-2b-2a-3b)
=(5a+b)(a-5b);
(2)-xy+2x2y+x3y=-xy(1-2x-x2).
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