题目内容

口算：
4
5
+
3
5
=
1
7
+
1
5
=
1
3
+2=
1
4
+
1
2
=		 1-
9
14
=
0.23×0.1=
2
5
+
2
3
-
2
5
=
4
5
-
4
5
=		 2÷0.5=
5
8
-
3
8
=
分析：本题根据分数，小数，整数的加法、减法、乘法与除法的运算法则计算即可；
2
5
+
2
3
-
2
5
利用加法交换律计算
2
5
-
2
5
+
2
3
计算简便．
解答：
解：
4
5
+
3
5
=
7
5
1
7
+
1
5
=
12
35
1
3
+2=2
1
3
1
4
+
1
2
=
3
4
 1-
9
14
=
5
14
0.23×0.1=0.023
2
5
+
2
3
-
2
5
=
2
3
4
5
-
4
5
=0		 2÷0.5=4
5
8
-
3
8
=
1
4
点评：完成本题要注意分析式中数据的特点，快速准确得出答案．
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23
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口算．
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8
+
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=
3
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5
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4
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8
21
×
7
16
=
1
20
×
2
3
=
5
6
×
2
15
=
15
17
×
17
15
=
3
4
×
1
5
=
6
11
×
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12
=
3
22
×
11
13
=
7
6
×24=
4
7
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3
8
=
13
15
×30=		 28×
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24
=
5
6
×
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7
=
口算：
3
4
×
3
5
=		 45×
4
9
=
5
24
÷10=		 0÷8
1
3
=
5.4×
4
9
=
4
5
÷
3
16
=		 0.65×
1
8
=		 50%-0.05=

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