题目内容
计算
①(-
+
-
)÷(-
);
②-14-[-2+(1-0.2÷
)×(-3 )].
①(-
| 3 |
| 4 |
| 5 |
| 12 |
| 7 |
| 6 |
| 1 |
| 60 |
②-14-[-2+(1-0.2÷
| 3 |
| 5 |
①原式=(-
+
-
)×(-60)
=
×60-
×60+
×60
=45-25+70
=90;
②原式=-1-[-2+(1-
)×(-3)]
=-1-(-2-
×3)
=-1-(-2-2)
=-1-(-4)
=-1+4
=3.
| 3 |
| 4 |
| 5 |
| 12 |
| 7 |
| 6 |
=
| 3 |
| 4 |
| 5 |
| 12 |
| 7 |
| 6 |
=45-25+70
=90;
②原式=-1-[-2+(1-
| 1 |
| 3 |
=-1-(-2-
| 2 |
| 3 |
=-1-(-2-2)
=-1-(-4)
=-1+4
=3.
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