试题:
用简便方法计算.
(1)
5
11
-0.8+
6
11

(2)2.5×4.4
(3)14
6
13
-7.75-2
1
4

(4)3.76×5
4
7
+3.76+3
3
7
×3.76

答案:

我来补答
(1)
5
11
-
0.8+
6
11

=
5
11
+
6
11
-
0.8,
=1-0.8,
=0.2;

(2)2.5×4.4,
=2.5×4+2.5×0.4,
=10+1,
=11;

(3)14
6
13
-
7.75-2
1
4

14
6
13
-
(7.75+2.25),
=14
6
13
-
10,
=4
6
13


(4)3.76×5
4
7
+3.76+3
3
7
×3.76,
=3.76×(5
4
7
+3
3
7
+
1),
=3.76×10,
=37.6.
 
 
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