2數(shù)學(xué)公式×15-(5數(shù)學(xué)公式+5數(shù)學(xué)公式)   
數(shù)學(xué)公式×54=
(9數(shù)學(xué)公式+7數(shù)學(xué)公式)÷(數(shù)學(xué)公式)      
97×2000-96×2001.

解:(1)2×15-(5+5),
=30-5-5
=30-5-5,
=25-5
=19;

(2)×54,
=(1-)×54,
=1×54-×54,
=54-,
=53;

(3)(9+7)÷(),
=16,
=×,
=13;

(4)97×2000-96×2001,
=97×2000-96×(2000+1),
=97×2000-96×2000-96×1,
=(97-96)×2000-96,
=1×2000-96,
=1904.
分析:(1)先算乘法,再根據(jù)減去兩個數(shù)的和等于連續(xù)減去這兩個數(shù)簡算;
(2)先把分解成(1-),再運(yùn)用乘法分配律簡算;
(3)同時運(yùn)算兩個括號里面的加法,再算括號外的除法;
(4)先把2001分解成2000+1,再兩次運(yùn)用乘法分配律簡算.
點(diǎn)評:本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算.
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