题目内容
计算:
(1)(2x)3×(-3xy2)
(2)(a+3b)(a-2b)-(2a-b)2
(3)(22000-21999)0-(-
)-2+(-0.125)9×810.
(1)(2x)3×(-3xy2)
(2)(a+3b)(a-2b)-(2a-b)2
(3)(22000-21999)0-(-
| 1 |
| 4 |
(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-(-
)-2+(-0.125)9×810=1-16+(-0.125×8)9×8=1-16-8=-23.
(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-(-
| 1 |
| 4 |
练习册系列答案
相关题目