题目内容
(1)计算:
+(x-2)0-(
)-1-2cos45°
(2)先化简,再求值:(
+
)÷(1+
),其中m=-3.
| 3 | 27 |
| 1 |
| 5 |
(2)先化简,再求值:(
| m2-1 |
| m2-2m+1 |
| m |
| m2-m |
| 2 |
| m |
(1)原式=3+1-5-
,
=-
-1;
(2)原式=[
+
]÷
,
=(
+
)÷
,
=
•
,
=
,
当m=-3时,原式=
=
.
| 2 |
=-
| 2 |
(2)原式=[
| (m+1)(m-1) |
| (m-1)2 |
| m |
| m(m-1) |
| m+2 |
| m |
=(
| m+1 |
| m-1 |
| 1 |
| m-1 |
| m+2 |
| m |
=
| m+2 |
| m-1 |
| m |
| m+2 |
=
| m |
| m-1 |
当m=-3时,原式=
| -3 |
| -3-1 |
| 3 |
| 4 |
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