题目内容

(2012?白云区)直接写出得数.
(1)3.6÷1.2=
(2)
2
3
+
1
2
=
(3)
7
10
×
5
14
=
(4)
1
2
+
1
2
=
(5)8+
4
3
-0.4
=
(6)0.6×0.5=
(7)
5
9
-
2
9
=
(8)
4
15
÷
28
45
=
(9)
3
5
×
1
6
×
5
7
=
(10)
10
9
-
1
6
-
5
6
=
(11)2÷
5
5
=0.4=
8
(   )
=
(   )
5
=
40
40
%
(12)0.75:0.2=(化成最简单的整数比)
分析:(1)--(8)根据运算法则直接求解;
(9)三个数约分化简;
(10)根据连续减去两个数等于减去这两个数的和简算;
(11)给出的值是0.4;先把它看成商:2÷0.4=5;所以写成除法算式就是2÷5;2÷5=
2
5
2
5
=
2×4
5×4
=
8
20
;0.4=40%;
(12)根据比的基本性质可知:0.75:0.2=75:20=15:4.
解答:解:(1)3.6÷1.2=3,
(2)
2
3
+
1
2
=
7
6

(3)
7
10
×
5
14
=
1
4

(4)
1
2
+
1
2
=1,
(5)8+
4
3
-0.4
=8
14
15

(6)0.6×0.5=0.3,
(7)
5
9
-
2
9
=
1
3

(8)
4
15
÷
28
45
=
3
7

(9)
3
5
×
1
6
×
5
7
=
1
14

(10)
10
9
-
1
6
-
5
6
=
1
9

(11)2÷5=0.4=
8
20
=
2
5
=40%
(12)0.75:0.2=15:4.
点评:本题考查了基本的运算,要注意分析数据,选择合适的简算方法计算.
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