题目内容
脱式计算.(能简算的要简算)
1
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| (
| 3.5×9.9. |
(1)1
| 1 |
| 10 |
| 1 |
| 4 |
=1
| 1 |
| 10 |
| 1 |
| 4 |
=1
| 1 |
| 10 |
=
| 1 |
| 10 |
(2)
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=(58+41+1)×
| 1 |
| 8 |
=100×
| 1 |
| 8 |
=12.5;
(3)
| 2 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
=0.4×
| 1 |
| 5 |
| 4 |
| 5 |
=0.4×(
| 1 |
| 5 |
| 4 |
| 5 |
=0.4×1,
=0.4;
(4)
| 5 |
| 9 |
| 5 |
| 9 |
=
| 1 |
| 9 |
=9
| 1 |
| 9 |
(5)(
| 7 |
| 12 |
| 1 |
| 3 |
| 2 |
| 7 |
=
| 1 |
| 4 |
| 2 |
| 7 |
=
| 1 |
| 14 |
(6)3.5×9.9,
=3.5×(10-0.1),
=3.5×10-3.5×0.1,
=35-0.35,
=34.65.
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