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口算
1
4
×
1
3
=
4
7
÷2
=
1
2
÷
1
2
=
10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6
=
8
9
÷4
=
15×
4
5
=
15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14
=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1
=
7
15
×5
=
3
4
=
1
2
÷
1
4
=
3
5
=
3
4
×12
=
1
5
÷
2
3
=
7
9
×
3
7
=
1-
3
5
=
18×
5
6
=
7
5
=
1
3
+
1
6
=
1+
3
5
=
2
9
×
1
4
=
8
3
÷2
=
3
5
÷
2
5
=
5
9
÷3
=
5
6
×
3
10
=
2
5
÷
1
2
=
1
4
=
3
4
=
30×
1
3
=
4
5
÷2
=
5
24
÷
5
6
=
5
8
×
1
2
×0
=
1
3
×
3
11
=
1
4
=
9
10
÷
3
5
=
1
3
÷
1
2
=
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=
5
12
=
1
2
÷
1
2
=
分析:
1
2
-
1
4
,
1
2
+
1
4
,1-
3
5
1
3
+
1
6
,計(jì)算時(shí)注意先通分再計(jì)算;0×
2
9
÷
1
2
,0÷
1
3
÷
1
2
,0÷
5
12
根據(jù)0和任何不等于0的數(shù)相乘,相除都得0計(jì)算;其他按運(yùn)算法則計(jì)算.
解答:解:口算
1
4
×
1
3
=
1
12
4
7
÷2
=
2
7
,
1
2
÷
1
2
=1,
10÷
5
6
=12,
2
3
×
3
4
=
1
2
,
9
10
÷
1
5
=
9
2
,
1
6
÷6
=
1
36
8
9
÷4
=
2
9
,
15×
4
5
=12,
15÷
1
3
=45,
3
4
×
2
9
=
1
6
2
3
÷
1
2
=
4
3
,
2
5
×
1
2
=
1
5
,
1
2
÷
1
4
=2,
1
2
×
1
4
=
1
8
,
4
5
÷
1
5
=4,
3
7
×14
=6,
1
4
÷
1
2
=
1
2
,
1
2
-
1
4
=
1
4
4
9
×
3
4
=
1
3
,
5
8
×
2
5
=
1
4
1
6
÷
2
3
=
1
4
,
1
2
+
1
4
=
3
4
3
5
÷1
=
3
5
7
15
×5
=
7
3
,
3
4
=
4
3
1
2
÷
1
4
=2,
3
5
=
5
3
,
3
4
×12
=9,
1
5
÷
2
3
=
3
10
,
7
9
×
3
7
=
1
3
1-
3
5
=
2
5
,
18×
5
6
=15,
7
5
=5,
1
3
+
1
6
=
1
2
,
1+
3
5
=1.6,
2
9
×
1
4
=
1
18
,
8
3
÷2
=
4
3
,
3
5
÷
2
5
=
3
2
,
5
9
÷3
=
5
27
,
5
6
×
3
10
=
1
4
,
2
5
÷
1
2
=
4
5
,
1
4
=2,
3
4
=12,
30×
1
3
=10,
4
5
÷2
=
2
5
5
24
÷
5
6
=
1
4
,
5
8
×
1
2
×0
=0,
1
3
×
3
11
=
1
11
1
4
=32,
9
10
÷
3
5
=
3
2
1
3
÷
1
2
=0,
9
11
=
9
11
,
2
5
÷
1
5
=2,
1
3
÷
1
3
=1,
2
9
÷
1
2
=0,
5
6
×
6
5
=1,
1
5
÷
1
3
=
3
5
,
5
12
=0,
1
2
÷
1
2
=1.
點(diǎn)評:此題考查同學(xué)們快速計(jì)算的能力,根據(jù)算式的特點(diǎn),靈活選擇計(jì)算方法.
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