(1)15÷
10
11
÷
3
7

=15×
11
10
11
10
×
7
3
7
3

=
77
2
77
2

(2)
6
7
÷
3
4
×
21
6

=
6
7
6
7
4
3
4
3
21
6
21
6
分析:(1)除以一個數(shù)等于乘這個數(shù)的倒數(shù),然后約分計算;
(2)根據(jù)除以一個數(shù)等于乘這個數(shù)的倒數(shù),把除法變?yōu)槌朔ǎ?/div>
解答:解:(1)15÷
10
11
÷
3
7

=15×
11
10
×
7
3
,
=
77
2
;

(2)
6
7
÷
3
4
×
21
6
,
=
6
7
×
4
3
×
21
6

=4.
故答案為:
11
10
,
7
3
77
2
,
6
7
,×,
4
3
,×,
21
6
點評:此題考查了“除以一個數(shù)等于乘這個數(shù)的倒數(shù)”這一知識點.
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