(1)45×2×5,運(yùn)用乘法結(jié)合律進(jìn)行簡(jiǎn)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(jiǎn)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(jiǎn)便方法進(jìn)行簡(jiǎn)算.
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