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        1. 精英家教網 > 小學數學 > 題目詳情
          口算
          1
          4
          +
          1
          3
          =
          1
          3
          -
          1
          5
          =
          1
          9
          =
          2
          27
          ×9=
          12
          17
          ÷12=
          2
          9
          ×
          3
          4
          =
          3
          4
          ÷
          1
          6
          =
          3
          8
          =
          7.8×9+7.8=
          5
          6
          +
          4
          11
          ×0=
          24×(
          3
          8
          +
          5
          6
          )=
          12×
          2
          25
          -
          24
          25
          =
          分析:根據分數和小數的加減乘除的計算方法進行計算即可;7.8×9+7.8和24×(
          3
          8
          +
          5
          6
          )可以根據乘法分配律進行簡算.
          解答:解:
          1
          4
          +
          1
          3
          =
          7
          12
          ,
          1
          3
          -
          1
          5
          =
          2
          15
          ,
          1
          9
          =9,
          2
          27
          ×9=
          2
          3
          ,
          12
          17
          ÷12=
          1
          17
          ,
          2
          9
          ×
          3
          4
          =
          1
          6
          3
          4
          ÷
          1
          6
          =
          9
          2
          3
          8
          =0,
          7.8×9+7.8=78,
          5
          6
          +
          4
          11
          ×0=
          5
          6
          ,
          24×(
          3
          8
          +
          5
          6
          )=29,
          12×
          2
          25
          -
          24
          25
          =0.
          點評:口算時,注意給出的數據和計算的符號,能簡算的要簡算.
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