题目内容
(1)计算2×(-3)+(-3)°-
;
(2)化简:(1+
)÷
.
| 4 |
(2)化简:(1+
| 1 |
| m-1 |
| m |
| m2-1 |
(1)原式=-6+1-2=-7;
(2)原式=(
+
)×
=
×
=m+1.
(2)原式=(
| m-1 |
| m-1 |
| 1 |
| m-1 |
| (m+1)(m-1) |
| m |
=
| m |
| m-1 |
| (m+1)(m-1) |
| m |
=m+1.
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