题目内容
计算:
(1)(-
)-1-3tan30°+(1-
)0+
;
(2)1-
÷(
-
).
(1)(-
| 1 |
| 2 |
| 2 |
| 12 |
(2)1-
| a-1 |
| a |
| a |
| a+2 |
| 1 |
| a2+2a |
(1)原式=-2-
+1+2
=-1+
;
(2)原式=1-
÷
=1-
×
=1-
=
=
.
| 3 |
| 3 |
=-1+
| 3 |
(2)原式=1-
| a-1 |
| a |
| (a+1)(a-1) |
| a(a+2) |
=1-
| a-1 |
| a |
| a(a+2) |
| (a+1)(a-1) |
=1-
| a+2 |
| a+1 |
=
| a+1-a-2 |
| a+1 |
=
| -1 |
| a+1 |
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