试题:
下面各题,怎样简便就怎样算.
13.1-4.12+(6.9+4.12)

28×(
3
4
+
1
7
-
3
28
94.6×18+5.4×18 4800÷(198-138)×80.

答案:

我来补答
(1)13.1-4.12+(6.9+4.12),
=13.1-4.12+6.9+4.12,
=(13.1+6.9)+(4.12-4.12),
=20;

(2)28×(
3
4
+
1
7
-
3
28
),
=28×
3
4
+28×
1
7
-28×
3
28

=21+4-3,
=22;

(3)94.6×18+5.4×18,
=(94.6+5.4)×18,
=100×18,
=1800;

(4)4800÷(198-138)×80,
=4800÷60×80,
=80×80,
=6400.
 
 
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这些题目你会做吗?