题目内容
脱式计算,能简算的一定要简算.
8.85-3.38+1.15-4.62
[1-(
+
)]÷
45×(
+
-
)
2.4÷[(2.2+3.8)×0.04].
8.85-3.38+1.15-4.62
[1-(
| 1 |
| 8 |
| 5 |
| 16 |
| 1 |
| 8 |
45×(
| 7 |
| 9 |
| 4 |
| 15 |
| 3 |
| 5 |
2.4÷[(2.2+3.8)×0.04].
(1)8.85-3.38+1.15-4.62,
=(8.85+1.15)-(3.38+4.62),
=10-8,
=2;
(2)[1-(
+
)]÷
,
=[1-
]÷
,
=
×8,
=
;
(3)45×(
+
-
),
=45×
+45×
-45×
,
=35+12-27,
=20;
(4)2.4÷[(2.2+3.8)×0.04],
=2.4÷[6×0.04],
=2.4÷0.24,
=10.
=(8.85+1.15)-(3.38+4.62),
=10-8,
=2;
(2)[1-(
| 1 |
| 8 |
| 5 |
| 16 |
| 1 |
| 8 |
=[1-
| 7 |
| 16 |
| 1 |
| 8 |
=
| 9 |
| 16 |
=
| 9 |
| 2 |
(3)45×(
| 7 |
| 9 |
| 4 |
| 15 |
| 3 |
| 5 |
=45×
| 7 |
| 9 |
| 4 |
| 15 |
| 3 |
| 5 |
=35+12-27,
=20;
(4)2.4÷[(2.2+3.8)×0.04],
=2.4÷[6×0.04],
=2.4÷0.24,
=10.
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