题目内容

计算下面各题,能简算得要简算.
5.3-3
4
5
+4.7-3
1
5
47.5×0.25+
1
4
×52.5
2
3
+(
1
3
+
1
2
)×
4
5
10.2÷[28×(1-
1
7
)+
3
2
].
①5.3-3
4
5
+4.7-3
1
5

=(5.3+4.7)-(3
4
5
+3
1
5
),
=10-7,
=3;

②47.5×0.25+
1
4
×52.5,
=47.5×0.25+0.25×52.5,
=0.25×(47.5+52.5),
=0.25×100,
=25;

2
3
+(
1
3
+
1
2
)×
4
5

=
2
3
+
5
6
×
4
5

=
2
3
+
2
3

=
4
3


④10.2÷[28×(1-
1
7
)+
3
2
],
=10.2÷[28×
6
7
+
3
2
],
=
51
5
÷
51
2

=
2
5
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