题目内容
计算下面各题.
| 657+360÷45×19 | 21×
| ||||||||
| 28.6-(12.6+18.4)÷1.6 | (
|
(1)657+360÷45×19,
=657+8×19,
=657+152,
=809;
(2)21×
| 3 |
| 4 |
| 4 |
| 5 |
| 8 |
| 21 |
=21×
| 3 |
| 4 |
| 5 |
| 4 |
| 8 |
| 21 |
=(21×
| 8 |
| 21 |
| 3 |
| 4 |
| 5 |
| 4 |
=8×
| 15 |
| 16 |
=
| 15 |
| 2 |
(3)28.6-(12.6+18.4)÷1.6,
=28.6-31÷1.6,
=28.6-19.375,
=9.225;
(4)(
| 3 |
| 4 |
| 5 |
| 6 |
| 19 |
| 24 |
| 8 |
| 9 |
=
| 19 |
| 12 |
| 19 |
| 24 |
| 8 |
| 9 |
=2+
| 8 |
| 9 |
=2
| 8 |
| 9 |
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