问题:
计算:
(1)计算:2cos45°+(
2
-1) 0-(
1
2
) -1
(2)化简: (
1
a
-1)÷
a2-1
a2+a
.
计算:
(1)计算:2cos45°+(
-1) 0-(
) -1
(2)化简: (
-1)÷
.
(1)计算:2cos45°+(
2 |
1 |
2 |
(2)化简: (
1 |
a |
a2-1 |
a2+a |
参考答案: