45×2×5 (710+190)×6 125×8×7 987×9+5.
分析:
      (1)45×2×5,運(yùn)用乘法結(jié)合律進(jìn)行簡算;
      (2)(710+190)×6,按照整數(shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
      (3)125×8×7,運(yùn)用乘法結(jié)合律進(jìn)行簡算;
      (4)987×9+5,按照整數(shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
      解答:解:(1)45×2×5,
      =45×(2×5),
      =45×10,
      =450;

      (2)(710+190)×6,
      =900×6,
      =5400;

      (3)125×8×7,
      =(125×8)×7,
      =1000×7,
      =7000;

      (4)987×9+5.
      =8883+5,
      =8888.
      點(diǎn)評:此題考查的目的是使學(xué)生掌握整數(shù)四則混合運(yùn)算的順序和整數(shù)四則運(yùn)算的計(jì)算法則,并且能夠靈活運(yùn)用簡便方法進(jìn)行簡算.
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