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-(
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
+
5
16
)]÷
1
8

=[1-
7
16
]÷
1
8

=
9
16
×8,
=
9
2


(3)45×(
7
9
+
4
15
-
3
5
),
=45×
7
9
+45×
4
15
-45×
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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