(1)5m-7n-8p+5n-9m-p;(2)(5x2y-7xy2)-(xy2-3x2y);(3)3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].
题型:解答题难度:一般来源:江苏期中题
(1)5m-7n-8p+5n-9m-p; (2)(5x2y-7xy2)-(xy2-3x2y); (3)3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]. |
答案
解:(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. |
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