化简:(1)5m-7n-8p+5n-9m-p;(2)(5x2y-7xy2)-(xy2-3x2y);(3)3(-3a2-2a)-[a2-2(5a-4a2+1)-3
题型:解答题难度:一般来源:不详
化简: (1)5m-7n-8p+5n-9m-p; (2)(5x2y-7xy2)-(xy2-3x2y); (3)3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]. |
答案
(1)原式=(5-9)m+(-7+5)n-(8+1)p =-4m-2n-9p;
(2)原式=5x2y-7xy2-xy2+3x2y =(5+3)x2+(-7-1))xy2=8x2y-8xy2;
(3)原式=3(-3a2-2a)-[a2-10a+8a2-2-3a] =-9a2-6a-9a2+13a+2 =-18a2+7a+2. |
举一反三
化简: (1)5m-7n-8p+5n-9m-p; (2)(5x2y-7xy2)-(xy2-3x2y); (3)3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]. |
化简下列各题: (1)5a4+3a2b-10-3a2b+a4-1; (2)2(2x2+9y)-3(-5x2-4y); (3)(a2-ab)+(2ab-b2)-2(a2+b2). |
化简下列各题: (1)5a4+3a2b-10-3a2b+a4-1; (2)2(2x2+9y)-3(-5x2-4y); (3)(a2-ab)+(2ab-b2)-2(a2+b2). |
化简求值: (1)-2x-[4x-2y-(3x-2y+1)],其中x=-3,y=2007; (2)xy-2y2-2[4xy-(3y2-x2y)+5(-3y2+x2y)],其中x=1,y=-2. |
化简求值: (1)-2x-[4x-2y-(3x-2y+1)],其中x=-3,y=2007; (2)xy-2y2-2[4xy-(3y2-x2y)+5(-3y2+x2y)],其中x=1,y=-2. |
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