计算:(1)x3-2x2-x3+5x2+4;(2)4xy-3x2-3xy-2y+2x2;(3)a2+2a3-3a3-5a2...
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发布时间:2024-10-24 08:18
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(1)原式=3x3+4;
(2)原式=(4xy-3xy)-(3x2+2x2)-2y
=xy-x2-2y;
(3)原式=(2a3-3a3-3a3)+(a2-5a2)
=-4a2-4a3;
(4)原式=3x2-x2-y2-y2
=2x2-2y2;
(5)原式=(2a2b-2a2b)+(2ab2-2ab2)-5+2
=-3;
(6)原式=10x-35y-12x+30y=-2x-5y;
(7)原式=2x2-xy+x2+xy-3=3x2-3;
(8)原式=-6x2+3xy+4x2+4xy-24
=-2x2+7xy-24.