计算：（1）(13)?2?(3?1)0+52+1（2）(1a+1b)÷a+bb
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（1）(
)?2?(
?1)0+
=9-1+
=8+5
-5
=3+5
（2）(
+
)÷
．
=
×
=
| 1 |
| 3 |
| 3 |
| 5 | ||
|
=9-1+
5(
| ||||
(
|
=8+5
| 2 |
=3+5
| 2 |
（2）(
| 1 |
| a |
| 1 |
| b |
| a+b |
| b |
=
| a+b |
| ab |
| b |
| a+b |
=
