题目内容

3
7
÷
3
4
×
4
3
．
分析：此题应先把除法改为乘法，然后约分计算．或按运算顺序，从左向右依次计算．
解答：解：
3
7
÷
3
4
×
4
3
，
=
3
7
×
4
3
×
4
3
，
=
16
21
．
点评：此题容易算成
3
7
÷1，因此应注意运算顺序．
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直接写出得数
2.4×5=		 250×0.02= 1-0.57= 12.5×16=
0.24÷1.2=
1
4
-
1
5
=
5
6
÷
2
3
=
1
2
+
2
5
=
7
1
5
÷0.8=		 25×
3
7
×
2
5
×
7
12
=		 1
1
5
-1
1
5
÷2=
3
4
×0.2=
3
4
×
4
3
÷5=		 178.5-36.5-63.5=
直接写出得数．
1
3
÷
3
5
=
4
7
×
3
4
=
9
22
÷
3
11
=		 1÷80%=
1÷
3
4
×
4
3
=
1
2
+
1
3
=		 3.5×
3
7
=		 2-
1
4
=
3
4
×2=
1
6
+
1
2
=
5
9
÷5=
1
12
×
6
7
=
3
4
÷3=
5
4
×
5
4
=
5
8
÷1=		 5-
2
3
=
3
9
×12=
3
5
×
5
12
=		 4-
2
3
=
7
12
×3=
2
7
÷14=		 8+
3
5
=		 0×
13
30
=		 39×
3
13
=
8×
1
2
=
5
6
÷
3
4
=		 4×
12
7
=		 20÷
4
5
=
1-
9
10
=		 2.5×16=
5
12
÷
1
6
=
3
2
×
4
5
=
8
15
÷24=		 11÷
22
8
=
1
2
÷
3
8
=
4
7
÷
2
3
=
3
4
+
1
7
=		 1.5÷0.05= 0×
1
9
×9=		 1.5÷0.05=
5
8
÷
7
12
=
4
5
×
2
3
×
5
6
=
5
9
×
2
5
=		 2.5×0.4=
14×
5
16
=		 (
1
2
+
1
3
)×12=
14
33
×
3
7
=		 0×
7
9
=
5
8
×
5
8
=
5
21
+
4
7
=
7
9
÷7=		 2-
1
4
=
3
5
-
1
8
=
4
21
÷
8
7
=
2
3
-
1
4
=		 6.25+1.75=
1
2
÷
7
18
=
9
10
×6=
1
8
+
1
9
=
3
4
÷
4
3
=
1
2
×
2
3
=		 12-
5
7
=		 1÷
2
5
=
2
9
÷18=
7
28
÷
2
9
=		 10×1×
2
5
=		 20÷
4
5
=
1
3
×9+9×
2
3
=
42÷
21
23
=
3
8
÷12=
用竖式计算．
73-25= 58-39= 54-36=
16+37= 23+38= 48+26=
40-13= 17+34= 43-29=

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