计算:(1)x3-2x2-x3+5x2+4;(2)4xy-3x2-3xy-2y+2x2;(3)a2+2a3-3a3-5a2-3a3;(4)3x2-(x2+y2)-y
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解决时间 2021-11-09 10:53
- 提问者网友:我一贱你就笑
- 2021-11-08 19:25
计算:(1)x3-2x2-x3+5x2+4;(2)4xy-3x2-3xy-2y+2x2;(3)a2+2a3-3a3-5a2-3a3;(4)3x2-(x2+y2)-y
最佳答案
- 五星知识达人网友:风格不统一
- 2021-11-08 19:43
(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.
(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.
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