题目内容
计算:
①
+(π-2012)0-(
)-2-|-7|
②
-
.
①
| 9 |
| 1 |
| 3 |
②
| 2x |
| 2x-y |
| y |
| 2x-y |
①
+(π-2012)0-(
)-2-|-7|
=3+1-9-7,
=-12;
②
-
=
,
=1.
| 9 |
| 1 |
| 3 |
=3+1-9-7,
=-12;
②
| 2x |
| 2x-y |
| y |
| 2x-y |
=
| 2x-y |
| 2x-y |
=1.
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