14
11
÷21
5
8
÷
5
6
8
9
÷
3
7
9
46
×
11
12
÷
22
23
40
7
÷5×
5
2
8
5
÷(
3
5
-
1
3
)
分析:(1)--(5)題,把除法變?yōu)槌朔,約分計算;
(6)題,先算括號內(nèi)的,再算括號外的.
解答:解:(1)
14
11
÷21
=
14
11
×
1
21

=
2
33


(2)
5
8
÷
5
6

=
5
8
×
6
5

=
3
4


(3)
8
9
÷
3
7

=
8
9
×
7
3

=
56
27


(4)
9
46
×
11
12
÷
22
23

=
9
46
×
11
12
×
23
22

=
3
16


(5)
40
7
÷5×
5
2

=
40
7
×
1
5
×
5
2

=
20
7


(6)
8
5
÷(
3
5
-
1
3

=
8
5
÷
4
15

=
8
5
×
15
4

=6
點評:此題主要考查分?jǐn)?shù)計算中乘除法的轉(zhuǎn)化,以及運用約分進行簡算.
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