题目内容
(1)计算:(
-1)0+
cos45°-(
)-2;
(2)化简:1-
÷
.
2012 |
18 |
1 |
2 |
(2)化简:1-
a-b |
2a+b |
a2-b2 |
4a2+4ab+b2 |
(1)原式=1+3
×
-4=1+3-4=0;
(2)原式=1-
÷
=1-
•
=1-
=-
.
2 |
| ||
2 |
(2)原式=1-
a-b |
2a+b |
(a+b)(a-b) |
(2a+b)2 |
a-b |
2a+b |
(2a+b)2 |
(a+b)(a-b) |
2a+b |
a+b |
a |
a+b |
练习册系列答案
相关题目