题目内容

口算．
4
5
+
1
5
=
5
8
-
1
8
=
4.3-1.6=
1
9
+
1
10
=
1-
1
5
=
1
2
-
1
5
=		 2-
3
4
=
1
4
+
3
8
=
分析：根据分数加减法、小数减法的运算方法进行计算即可得到答案．
解答：解：
4
5
+
1
5
=1              
5
8
-
1
8
=
1
2
            4.3-1.6=2.7             
1
9
+
1
10
=
19
90

1-
1
5
=
4
5
                 
1
2
-
1
5
=
3
10
            2-
3
4
=1
1
4
                  
1
4
+
3
8
=
5
8
．
点评：此题主要考查的是分数加减法和小数减法的计算方法．
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相关题目
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
=
口算
0.75÷15=
2
3
-
2
3
×0=
3
4
×4÷
3
4
×4=		 0.5×（2.6-2.4）=
18
9
10
÷9=		 12×（
1
4
+
1
6
）=		 250×
1
5
+250×
4
5
=		 2.5×3.5×0.4=
口算：
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
7
12
×
3
4
=		 1×
3
20
=
2
5
×
15
4
=
4
17
×34=
8
21
×
7
16
=
1
20
×
2
3
=
5
6
×
2
15
=
15
17
×
17
15
=
口算：
4
5
+
2
5
=		 3-2
1
4
=		 1
4
5
÷1=		 7×
4
5
÷7×
4
5
=
5
5
8
÷5=
3
4
×1.2=
5
8
×1
3
5
=		 （
1
4
+
1
5
）×20=

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