题目内容

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.
(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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