题目内容

脱式计算下面各题.
12380-450÷18×482.3+3.91÷(22-19.7)
1
5
÷(
2
3
+
1
5
)×
1
13
(1)12380-450÷18×482,
=12380-25×482,
=12380-12050,
=330;

(2)3+3.91÷(22-19.7),
=3+3.91÷2.3,
=3+1.7,
=4.7;

(3)
1
5
÷
2
3
+
1
5
)×
1
13

=
1
5
×
15
13
×
1
13

=
3
169
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