计算(1)(6a2-8a+11b3)-(11a2+2b3)(2)(3x+9)(6x+8)(3)(4a3b-6a2 b2+12ab3)÷2ab(4)(x+2)2-
题型:解答题难度:一般来源:不详
计算 (1)(6a2-8a+11b3)-(11a2+2b3) (2)(3x+9)(6x+8) (3)(4a3b-6a2 b2+12ab3)÷2ab (4)(x+2)2-(x+1)(x-1) |
答案
(1)原式=6a2-8a+11b3-11a2-2b3 =(11b3-2b3)+(6a2-11a2)-8a =9b3-5b2-8a; (2)原式=18x2+24x+54x+72 =18x2+78x+72; (3)原式=4a3b÷2ab-6a2 b2÷2ab+12ab3÷2ab =2a2-3ab+6b2; (4)原式=x2+4x+4-x2+1 =4x+5. |
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