123.4÷4÷25 48×25 5.8×101
1.2×25×4 46×6.8+6.8×54 99×7.9+7.9
101×0.38-0.38.
分析:①運(yùn)用一個(gè)數(shù)除以2個(gè)數(shù),可以用這個(gè)數(shù)除以這兩個(gè)數(shù)的積進(jìn)行計(jì)算.
②④運(yùn)用乘法的結(jié)合律及交換律進(jìn)行解答即可.
③⑤⑥⑦運(yùn)用乘法的分配律進(jìn)行解答即可.
解答:

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      解:①123.4÷4÷25,
      =123.4÷(4×25),
      =123.4÷100,
      =1.234;②48×25,
      =12×4×25,
      =12×(4×25),
      =12×100,
      =1200;

      ③5.8×101,
      =5.8×(100+1),
      =5.8×100+5.8,
      =580+5.8,
      =585.8;

      ④1.2×25×4,
      =1.2×(25×4),
      =1.2×100,
      =120;

      ⑤46×6.8+6.8×54,
      =6.8×(46+54),
      =6.8×100,
      =680;

      ⑥99×7.9+7.9,
      =7.9×(99+1),
      =7.9×100,
      =790;

      ⑦101×0.38-0.38,
      =0.38×(101-1),
      =0.38×100,
      =380;
      點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.
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