计算:(1)(2x)3×(-3xy2)(2)(a+3b)(a-2b)-(2a-b)2(3)(22000-21999)0-(-14)-2+(-0.125)9×810.-数学

题目简介

计算:(1)(2x)3×(-3xy2)(2)(a+3b)(a-2b)-(2a-b)2(3)(22000-21999)0-(-14)-2+(-0.125)9×810.-数学

题目详情

计算:
(1)(2x)3×(-3xy2
(2)(a+3b)(a-2b)-(2a-b)2
(3)(22000-21999)0-(-
1
4
)-2+(-0.125)9×810
题型:解答题难度:中档来源:不详

答案

(1)(2x)3×(-3xy2)=8x3×(-3xy2)=-24x4y2;
(2)(a+3b)(a-2b)-(2a-b)2
=a2-2ab-6b2-(4a2-4ab-b2)
=a2-2ab-6b2-4a2+4ab+b2
=-3a2+2ab-5b2;
(3)(22000-21999)0-(-class="stub"1
4
)-2+(-0.125)9×810
=1-16+(-0.125×8)9×8=1-16-8=-23.

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