问题 解答题
能简便就简便 
3
1
8
×7.4-3
1
8
+3.6×3.125
10
4
5
-(8.8-
5
7
)+
2
7

14.4÷0.6-4.2×3.
答案

(1)3

1
8
×7.4-3
1
8
+3.6×3.125

=3.125×7.4-3.125+3.6×3.125,

=(7.4+3.6-1)×3.125,

=10×3.125,

=31.25;

(2)10

4
5
-(8.8-
5
7
)+
2
7

=10.8-8.8+(

5
7
+
2
7
),

=2+1,

=3;

(3)14.4÷0.6-4.2×3

=24-12.6,

=11.4.

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