计算:(1)(65×103)2×(12×104)(2)t3-2t[t2-2t(t-3)](3)(2a+b)(b-2a)-(a-3b)2(4)-5x(-x2+2x+1)-(2x+3)(5-x2)-数学

题目简介

计算:(1)(65×103)2×(12×104)(2)t3-2t[t2-2t(t-3)](3)(2a+b)(b-2a)-(a-3b)2(4)-5x(-x2+2x+1)-(2x+3)(5-x2)-数学

题目详情

计算:
(1)(
6
5
×1032×(
1
2
×104
(2)t3-2t[t2-2t(t-3)]
(3)(2a+b)(b-2a)-(a-3b)2
(4)-5x(-x2+2x+1)-(2x+3)(5-x2
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"36
25
×106×class="stub"1
2
×104=class="stub"18
25
×1010;
(2)原式=t3-2t(t2-2t2+6t)=t3-2t3+4t3-12t2=3t3-12t2;
(3)原式=b2-4a2-a2+6ab-9b2=-5a2+6ab-8b2;
(4)原式=5x3-10x2-5x-(10x-2x3+15-3x2)=5x3-10x2-5x-10x+2x3-15+3x2=7x3-7x2-15x-15.

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