题目内容

计算下面各题,能简算的要简算.
(1)57-
3
11
-
8
11
(2)5.7×20%+
1
5
×
3
10
(3)4.2÷[
7
8
×(1-
1
7
)].
(1)57-
3
11
-
8
11

=57-(
3
11
+
8
11
),
=57-1,
=56;

(2)5.7×20%+
1
5
×
3
10

=5.7×0.2+0.2×0.3,
=(5.7+0.3)×0.2,
=6×0.2,
=1.2;

(3)4.2÷[
7
8
×(1-
1
7
)],
=4.2÷[
7
8
×
6
7
],
=4.2÷
3
4

=4.2×
4
3

=5.6.
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