题目内容
用递等式计算.
(1)
÷1
×2
-
÷7
(2)(18.6-18.6÷3.1)×0.01+0.09
(3)[5-1.7÷(1
-
)]×1
.
(1)
| 7 |
| 15 |
| 1 |
| 5 |
| 4 |
| 7 |
| 4 |
| 7 |
(2)(18.6-18.6÷3.1)×0.01+0.09
(3)[5-1.7÷(1
| 1 |
| 12 |
| 3 |
| 8 |
| 7 |
| 13 |
(1)
÷1
×2
-
÷7,
=
×
×
-
×
,
=1-
,
=
;
(2)(18.6-18.6÷3.1)×0.01+0.09,
=(18.6-6)×0.01+0.09,
=12.6×0.01+0.09,
=0.126+0.09,
=0.216;
(3)[5-1.7÷(1
-
)]×1
,
=[5-1.7×(
-
)]×
,
=[5-1.7÷
]×
,
=[5-1.7×
]×
,
=[5-2.4]×
,
=2.6×
,
=4.
| 7 |
| 15 |
| 1 |
| 5 |
| 4 |
| 7 |
| 4 |
| 7 |
=
| 7 |
| 15 |
| 5 |
| 6 |
| 18 |
| 7 |
| 4 |
| 7 |
| 1 |
| 7 |
=1-
| 4 |
| 49 |
=
| 45 |
| 49 |
(2)(18.6-18.6÷3.1)×0.01+0.09,
=(18.6-6)×0.01+0.09,
=12.6×0.01+0.09,
=0.126+0.09,
=0.216;
(3)[5-1.7÷(1
| 1 |
| 12 |
| 3 |
| 8 |
| 7 |
| 13 |
=[5-1.7×(
| 26 |
| 24 |
| 9 |
| 24 |
| 20 |
| 13 |
=[5-1.7÷
| 17 |
| 24 |
| 20 |
| 13 |
=[5-1.7×
| 24 |
| 17 |
| 20 |
| 13 |
=[5-2.4]×
| 20 |
| 13 |
=2.6×
| 20 |
| 13 |
=4.
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