题目内容
计算:
(1)(
a-1b-3)÷(-
a-2b-4)
(2)[
-
]•
.
(1)(
| 1 |
| 2 |
| 5 |
| 8 |
(2)[
| m-n |
| m2-2mn+n2 |
| mn+n2 |
| m2-n2 |
| mn |
| n-1 |
(1)原式=-
ab;
(2)原式=[
-
]•
=
•
=-
.
| 4 |
| 5 |
(2)原式=[
| m-n |
| (m-n)2 |
| n(m+n) |
| (m+n)(m-n) |
| mn |
| n-1 |
=
| 1-n |
| m-n |
| mn |
| n-1 |
=-
| mn |
| m-n |
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