试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)x(x﹣y)﹣y(y﹣x);
(2)a2x2y﹣axy2 .
(1)(a﹣3)2+(3﹣a);
(2)an+2+an+1﹣3an;
(3)(a2+4)2﹣16a2 .
①x2y+xy2;
②x2﹣xy+y2;
③x﹣y的值.
试题篮