题目内容
用简便方法计算
5-
÷
-
4.9×6.4+14×0.36-6.4×3.5.
5-
| 9 |
| 4 |
| 45 |
| 8 |
| 3 |
| 5 |
4.9×6.4+14×0.36-6.4×3.5.
(1)5-
÷
-
,
=5-
×
-
,
=5-
-
,
=5-(
+
),
=5-1,
=4;
(2)4.9×6.4+14×0.36-6.4×3.5,
=(4.9-3.5)×6.4+14×0.36,
=1.4×6.4+14×0.36,
=1.4×6.4+1.4×3.6,
=1.4×(6.4+3.6),
=1.4×10,
=14.
| 9 |
| 4 |
| 45 |
| 8 |
| 3 |
| 5 |
=5-
| 9 |
| 4 |
| 8 |
| 45 |
| 3 |
| 5 |
=5-
| 2 |
| 5 |
| 3 |
| 5 |
=5-(
| 2 |
| 5 |
| 3 |
| 5 |
=5-1,
=4;
(2)4.9×6.4+14×0.36-6.4×3.5,
=(4.9-3.5)×6.4+14×0.36,
=1.4×6.4+14×0.36,
=1.4×6.4+1.4×3.6,
=1.4×(6.4+3.6),
=1.4×10,
=14.
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