题目内容
用简便方法计算.
13.92-(1.19+9.92)-2.81
(
+
-
)×30.
13.92-(1.19+9.92)-2.81
(
| 2 |
| 5 |
| 1 |
| 6 |
| 2 |
| 15 |
13.92-(1.19+9.92)-2.81
=13.92-9.92-1.19-2.81
=4-(1.19+2.81)
=4-4
=0;
(2)(
+
-
)×30
=
×30+
×30-
×30
=12+5-4
=13;
故答案为0;13.
=13.92-9.92-1.19-2.81
=4-(1.19+2.81)
=4-4
=0;
(2)(
| 2 |
| 5 |
| 1 |
| 6 |
| 2 |
| 15 |
=
| 2 |
| 5 |
| 1 |
| 6 |
| 2 |
| 15 |
=12+5-4
=13;
故答案为0;13.
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