问题 解答题
用简便方法计算.
(1)
5
12
×
2
5
+
4
5
÷
12
5
(2)46.5-3.6-6.4+3.5.
答案

(1)

5
12
×
2
5
+
4
5
÷
12
5

=

5
12
×
2
5
+
4
5
×
5
12

=

5
12
×(
2
5
+
4
5
),

=

5
12
×
6
5

=

1
2

(2)46.5-3.6-6.4+3.5,

=(46.5+3.5)-(3.6+6.4),

=50-10,

=40;

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