试题 试卷
题型:单选题 题类:易错题 难易度:普通
(1)x(x﹣y)﹣y(y﹣x);
(2)a2x2y﹣axy2 .
(1)2x(a﹣b)+3y(b﹣a)
(2)x(x2﹣xy)﹣(4x2﹣4xy)
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