题目内容
计算:
(1)
+
(
-
)+
;
(2)(a2
-
+
)÷a2b2
(m>0,n>0).
(1)
| 1 | ||
|
| 3 |
| 3 |
| 6 |
| 8 |
(2)(a2
|
| ab |
| m |
| mn |
| n |
| m |
|
|
(1)原式=
+(
-3
)+2
=
+1+3-3
+2
=4;
(2)原式=(a2•
-
+
•
)÷(a2b2•
)
=
(
+
)×
×
,
=
.
| ||||
(
|
| 9 |
| 2 |
| 2 |
=
| 2 |
| 2 |
| 2 |
=4;
(2)原式=(a2•
| ||
| m |
| ab |
| m |
| mn |
| n |
| m |
| ||
| n |
| ||
| m |
=
| mn |
| a2-ab |
| m |
| 1 |
| m |
| 1 |
| a 2b 2 |
| m | ||
|
=
| a2-ab+1 |
| a2b2 |
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