题目内容

111×3÷9÷7.40.125×103-12.5
数学公式0.56×0.7+0.07×5.6

解:(1)111×3÷9÷7.4,
=333÷9÷7.4,
=37÷7.4,
=5;

(2)0.125×103-12.5,
=0.125×103-0.125×100,
=0.125×(103-100),
=0.125×3,
=0.375;

(3)×999+
=×(999+1),
=×1000,
=28;

(4)0.56×0.7+0.07×5.6,
=0.392+0.392,
=0.784.
分析:(1)按照从左到右的顺序计算;
(2)(3)运用乘法分配律简算;
(4)同时运算两个乘法,再算加法.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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