题目内容
用简便方法计算(写出主要过程)
|
| 3.5%×9.9. |
(1)
+6.85+1.6+
,
=8.4+6.85+1.6+2.15,
=(8.4+1.6)+(6.85+2.15),
=10+9,
=19;
(2)
÷
+5.25×
,
=12.75×
+5.25×
,
=(12.75+5.25)×
,
=18×
,
=15;
(3)3.5%×9.9,
=3.5%×(10-0.1),
=3.5%×10-3.5%×0.1,
=0.35-0.0035,
=0.3465.
| 42 |
| 5 |
| 43 |
| 20 |
=8.4+6.85+1.6+2.15,
=(8.4+1.6)+(6.85+2.15),
=10+9,
=19;
(2)
| 51 |
| 4 |
| 6 |
| 5 |
| 5 |
| 6 |
=12.75×
| 5 |
| 6 |
| 5 |
| 6 |
=(12.75+5.25)×
| 5 |
| 6 |
=18×
| 5 |
| 6 |
=15;
(3)3.5%×9.9,
=3.5%×(10-0.1),
=3.5%×10-3.5%×0.1,
=0.35-0.0035,
=0.3465.
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