用简便方法计算. (1)512×25+45÷125 (2)46.5-3.6-6.4+3.5.

用简便方法计算. (1)512×25+45÷125 (2)46.5-3.6-6.4+3.5.

(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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