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        1. 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
          ,計算時注意先通分再計算;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計算;其他按運算法則計算.
          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.
          點評:此題考查同學(xué)們快速計算的能力,根據(jù)算式的特點,靈活選擇計算方法.
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