题目内容
计算下列各题.(能简算的要简算)
3.8-1.9+7.2-8.1
(
+
)÷
÷15=
40-(7.7+4.8÷1.2)
(
+
)×13×29=
3.8-1.9+7.2-8.1
(
| 7 |
| 8 |
| 5 |
| 8 |
| 3 |
| 7 |
40-(7.7+4.8÷1.2)
(
| 3 |
| 29 |
| 1 |
| 13 |
(1)3.8-1.9+7.2-8.1,
=(3.8+7.2)-(1.9+8.1),
=11-10,
=1;
(2)(
| 7 |
| 8 |
| 5 |
| 8 |
| 3 |
| 7 |
=
| 3 |
| 2 |
| 3 |
| 7 |
=
| 7 |
| 2 |
=
| 7 |
| 30 |
(3)40-(7.7+4.8÷1.2),
=40-(7.7+4),
=40-11.7,
=28.3;
(4)(
| 3 |
| 29 |
| 1 |
| 13 |
=
| 3 |
| 29 |
| 1 |
| 13 |
=39+29,
=68.
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