题目内容

计算下面各题.
13.4×5.6×2.5 
6.75×0.12+15.73 
3.25×7.4-8.5
1 8.7×3.3-15.2×2.6 
45.2-14.36+17.6 
9.43×61+24.77.

解:(1)13.4×5.6×2.5,
=75.04×2.5,
=187.6;

(2)6.75×0.12+15.73,
=0.81+15.73,
=16.54;

(3)3.25×7.4-8.5,
=24.05-8.5,
=15.55;

(4)18.7×3.3-15.2×2.6,
=61.71-39.52,
=22.19;

(5)45.2-14.36+17.6,
=30.84+17.6,
=48.44;

(6)9.43×61+24.77,
=575.23+24.77,
=600.
分析:(1)按照从左向右的顺序进行计算;
(2)先算乘法,再算减法;
(3)先算乘法,再算加法;
(4)先算乘法,再算减法;
(5)按照从左向右的顺序进行计算;
(6)先算乘法,再算加法.
点评:此题主要考查小数的四则混合运算的运算顺序,然后根据运算顺序进行计算.
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