试题:
下面各题怎样简便就怎样算.
(1)2.7×99+2.7    
(2)
3
4
+
1
6
-
3
8

(3)3.93+1.64+6.07+8.36
(4)(7.9-3.06÷0.51)×5
(5)15-11.17-2.83
(6)15×(
1
3
+
1
5

答案:

我来补答
(1)2.7×99+2.7,
=2.7×(99+1),
=2.7×100,
=270;
    
(2)
3
4
+
1
6
-
3
8

=
18
24
+
4
24
-
9
24

=
13
24


(3)3.93+1.64+6.07+8.36,
=(3.93+6.07)+(1.64+8.36),
=10+10,
=20;

(4)(7.9-3.06÷0.51)×5,
=(7.9-6)×5,
=1.9×5,
=9.5;

(5)15-11.17-2.83,
=15-(11.17+2.83),
=15-14,
=1;

(6)15×(
1
3
+
1
5
),
=15×
1
3
+15×
1
5

=5+3,
=8.
 
 
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这些题目你会做吗?