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57÷(3.82+91.18)-0.02

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57÷(3.82+91.18)-0.02
[10-(7.3-3.5)]×0.8
1
20
+
1
2
+
4
5
(1)57÷(3.82+91.18)-0.02,
=57÷95-0.02,
=0.6-0.02,
=0.58;
(2)[10-(7.3-3.5)]×0.8,
=[10-3.8]×0.8,
=6.2×0.8,
=4.96;
(3)
1
20+
1
2+
4
5,
=
1
20+
10
20+
16
20,
=
27
20;
(4)
11
12-
2
3+
5
6,
=
11
12-
8
12+
10
12,
=
13
12.