3
4
÷
5
6
=
1
3
÷3=
5
4
×
2
3
×
4
5
=
1
3
×9×
2
3
=
6
7
÷2=
5
6
-
5
6
÷5=
7-
9
10
=
(1.6+3.2)×0.125=
5
12
=
分析:①、②、⑤根據(jù)除以一個數(shù)等于乘以這個數(shù)的倒數(shù)計算,
③利用乘法的交換律計算,
④、⑥、⑦、⑨按分數(shù)的四則混合運算順序計算,
⑧利用乘法的結(jié)合律計算.
解答:

      解:①
      3
      4
      ÷
      5
      6
      ,
      =
      3
      4
      ×
      6
      5

      =
      9
      10
      ;
      1
      3
      ÷3,
      =
      1
      3
      ×
      1
      3
      ,
      =
      1
      9

      5
      4
      ×
      2
      3
      ×
      4
      5
      ,
      =
      5
      4
      ×
      4
      5
      ×
      2
      3
      ,
      =1×
      2
      3
      ,
      =
      2
      3
      ;
      1
      3
      ×9×
      2
      3

      =
      9×2
      3×3
      ,
      =2;
      6
      7
      ÷2,
      =
      6
      7
      ×
      1
      2

      =
      3
      7
      ;
      ⑥5÷
      5
      6
      -
      5
      6
      ÷5,
      =5×
      6
      5
      -
      5
      6
      ×
      1
      5
      ,
      =6-
      1
      6
      ,
      =5
      5
      6

      ⑦7-
      9
      10
      =6
      1
      10
      ;
      ⑧(1.6+3.2)×0.125,
      =(0.2+0.4)×8×0.125,
      =(0.2+0.4)×(8×0.125),
      =0.6×1,
      =0.6;
      ⑨6×
      5
      12
      =
      5
      2
      點評:此題考查了分數(shù)的乘除法以及運算定律的運用.
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