题目内容

口算．
2
9
×
3
5
=
3
8
+
1
4
=
3
50
×
5
6
=
4
5
÷
8
15
=
1
9
÷
2
3
=
1
7
×5=
5
6
÷2=
3
5
-
1
6
=
分析：①③约分计算；②⑧通分计算；④⑤⑦把除法改为乘法，再计算；⑥整数5与分子1相乘的积做分子，分母不变．
解答：解：
2
9
×
3
5
=
2
15
3
8
+
1
4
=
5
8
3
50
×
5
6
=
1
20
4
5
÷
8
15
=
3
2
1
9
÷
2
3
=
1
6
1
7
×5=
5
7
5
6
÷2=
5
12
3
5
-
1
6
=
13
30
点评：此题考查了约分、通分以及乘除法的转化等知识，根据题目特点，灵活解答．
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口算
69×
5
23
=
3
5
÷
5
3
=
4
5
×
2
9
=
5
9
÷
5
18
=
0.74+
2
5
=		 2
1
5
-
1
2
=
7
20
×
5
7
=
5
14
×21=
5
6
×0÷
5
6
=		 12×（
1
4
+
1
3
）=
口算．
8.35-1.25=		 12.62+3.42= 9.16-3.26=
6.2+1.8= 18-1.47= 80×0.125=
3.7×2= 0.25×16= 33+7.69=
0.48÷0.01= 1.25×8= 3.6÷0.6=
9.1÷0.07= 0.72÷12= 0.9×0.1=
2.01+3.9= 0÷0.1×29= 0.7×0.04=
口算．
2
9
×
3
5
=
3
8
+
1
4
=
3
50
×
5
6
=
4
5
÷
8
15
=
1
9
÷
2
3
=
1
7
×5=
5
6
÷2=
3
5
-
1
6
=
口算．
2
9
×
3
5
=
3
8
+
1
4
=
3
50
×
5
6
=
4
5
÷
8
15
=
1
9
÷
2
3
=
1
7
×5=
5
6
÷2=
3
5
-
1
6
=

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