题目内容

口算．
5
16
÷
1
4
=		 42×
2
3
=		 91÷
13
14
=
7
10
÷
2
5
=
1
2
-
1
3
=
5
6
×
4
5
=
分析：根据分数四则运算的计算方法，计算得解．
解答：

解：
5
16
÷
1
4
=
5
4
，		 42×
2
3
=28，		 91÷
13
14
=98，
7
10
÷
2
5
=
7
4
，
1
2
-
1
3
=
1
6
，
5
6
×
4
5
=
2
3
．
点评：此题考查分数四则运算的计算方法的灵活运用，熟记方法，计算即可．
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“口算”对对碰
3
4
+
1
4
=
2+
4
9
=
1
7
+
3
7
+
5
7
=
3-
3
4
=
2
3
+
1
6
=
5
16
-
1
16
-
1
16
=
口算
1÷
3
5
=		 0÷3
1
4
=
4
25
×
5
16
=		 2.6-
3
5
=
0.125×8×
3
7
=		 10×0.1%=
14×
4
7
÷4=		 （1+
2
7
）÷4=
（1+
2
7
）×
1
7
=		 99+1%=
口算．
4
7
+
2
3
=
99×
1
9
=
15
8
×
4
25
=
6-
3
5
-
2
5
=
1
4
×
2
3
×
1
5
=
4
15
×75=
23
24
×
8
69
=
1
6
×
4
7
=
5
16
×
18
15
=
1
3
×（1-
1
4
）=
口算下面各题．
1
3
-
1
5
=
1
4
+
3
5
=
7
8
-
1
2
=		 2÷
1
4
=
7
10
×6=
8
9
÷
8
10
=
1
3
×6=
3
8
×
1
4
=
2
3
-
1
4
=
1
6
÷
1
3
=
1
2
÷
3
4
=
8
19
×
5
16
=
1
4
×
4
10
=
7
12
÷
7
4
=
5
7
÷
10
21
=		 6.4÷0.08= 4-2.92=
7
9
÷
6
7
=

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