题目内容
(2012?白云区)直接写出得数.
(1)3.6÷1.2=
(2)
+
=
(3)
×
=
(4)
+
=
(5)8+
-0.4=
(6)0.6×0.5=
(7)
-
=
(8)
÷
=
(9)
×
×
=
(10)
-
-
=
(11)2÷
=
=
(12)0.75:0.2=(化成最简单的整数比)
(1)3.6÷1.2=
(2)
| 2 |
| 3 |
| 1 |
| 2 |
(3)
| 7 |
| 10 |
| 5 |
| 14 |
(4)
| 1 |
| 2 |
| 1 |
| 2 |
(5)8+
| 4 |
| 3 |
(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=
;
=
=
;0.4=40%;
(12)根据比的基本性质可知:0.75:0.2=75:20=15:4.
(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 |
(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)
+
=
,
(3)
×
=
,
(4)
+
=1,
(5)8+
-0.4=8
,
(6)0.6×0.5=0.3,
(7)
-
=
,
(8)
÷
=
,
(9)
×
×
=
,
(10)
-
-
=
,
(11)2÷5=0.4=
=
=40%
(12)0.75:0.2=15:4.
(2)
| 2 |
| 3 |
| 1 |
| 2 |
| 7 |
| 6 |
(3)
| 7 |
| 10 |
| 5 |
| 14 |
| 1 |
| 4 |
(4)
| 1 |
| 2 |
| 1 |
| 2 |
(5)8+
| 4 |
| 3 |
| 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 |
(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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