题目内容

计算:(用你喜欢的方法计算下面各题)
2
5
×0.25+
1
4
×3.6
2.5×320×0.125
7.5-(
1
5
+
1
3
)×4.5
75×
3
5
+24×60%+
3
5
(1)
2
5
×0.25+
1
4
×3.6,
=
2
5
×
1
4
+
1
4
×3.6,
=(
2
5
+3.6)×
1
4

=4×
1
4

=1;

(2)2.5×320×0.125,
=2.5×(4×80)×0.125,
=(2.5×4)×(80×0.125),
=10×10,
=100;

(3)7.5-(
1
5
+
1
3
)×4.5,
=7.5-(
1
5
×4.5+
1
3
×4.5),
=7.5-(0.9+1.5),
=7.5-2.4,
=5.1;

(4)75×
3
5
+24×60%+
3
5

=75×
3
5
+24×
3
5
+
3
5

=(75+24+1)×
3
5

=100×
3
5

=60.
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