45×2×5 (710+190)×6 125×8×7 987×9+5.
分析:
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        • (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(píng):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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