题目内容
脱式计算,写出主要计算过程,能用简便算法的要用简便算法.
①12×
| ②
| ③14÷(
| ||||||||||||||
| ④3.6-2.8+16.4-7.2 | ⑤77×
|
①12×
÷
=12×
×
=6;
②
+
×9
=
+5
=5
;
③14÷(
+
)×
=14÷
×
=14×
×
=9;
④3.6-2.8+16.4-7.2
=(3.6+16.4)-(2.8+7.2)
=20-10
=10;
⑤77×
+23×0.8
=(77+23)×0.8
=100×0.8
=80.
| 3 |
| 8 |
| 3 |
| 4 |
=12×
| 3 |
| 8 |
| 4 |
| 3 |
=6;
②
| 4 |
| 9 |
| 5 |
| 9 |
=
| 4 |
| 9 |
=5
| 4 |
| 9 |
③14÷(
| 1 |
| 3 |
| 5 |
| 6 |
| 3 |
| 4 |
=14÷
| 7 |
| 6 |
| 3 |
| 4 |
=14×
| 6 |
| 7 |
| 3 |
| 4 |
=9;
④3.6-2.8+16.4-7.2
=(3.6+16.4)-(2.8+7.2)
=20-10
=10;
⑤77×
| 4 |
| 5 |
=(77+23)×0.8
=100×0.8
=80.
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