问题 解答题
怎样算简便就怎样算.
(1)(
1
2
+20%)×
5
6

(2)3.7×125%+1.25×2.7+1
1
4
×3.6.
(3)5×
3
4
+75%×6-0.75.
答案

(1)(

1
2
+20%)×
5
6

=(

1
2
+
1
5
)×
5
6

=

7
10
×
5
6

=

7
12

(2)3.7×125%+1.25×2.7+1

1
4
×3.6,

=3.7×1.25+1.25×2.7+1.25×3.6,

=1.25×(3.7+2.7+3.6),

=1.25×10,

=12.5;

(3)5×

3
4
+75%×6-0.75,

=5×0.75+0.75×6-0.75,

=(5+6-1)×0.75,

=10×0.75,

=7.5.

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