题目内容
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 |
(1)原式=2×
+1-2
=
+1-2
=
-1;
(2)原式=
•
=-
•
=-1.
| ||
2 |
=
2 |
=
2 |
(2)原式=
1-a |
a |
a(a+1) |
(a+1)(a-1) |
=-
a-1 |
a |
a(a+1) |
(a+1)(a-1) |
=-1.
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