题目内容

计算下面各题,能简算的要简算.   
0.125×32×2.5
0.8×6.3-0.8×3.8 50.4÷3.2×2.08
204÷(3.4×0.5) (43.26+2.34)÷7.5 (20-0.8×9)×5.7.
分析:(1)先把32分解成8×4,再运用乘法结合律简算;(2)运用乘法分配律简算;其他题目按照先算乘除,再算加减,有括号的先算括号里面的顺序计算.
解答:解:(1)0.125×32×2.5,
=0.125×8×4×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;

(2)0.8×6.3-0.8×3.8,
=(6.3-3.8)×0.8,
=2.5×0.8,
=2;

(3)50.4÷3.2×2.08,
=15.75×2.08,
=32.76;

(4)204÷(3.4×0.5),
=204÷1.7,
=120;

(5)(43.26+2.34)÷7.5,
=45.6÷7.5,
=6.08;

(6)(20-0.8×9)×5.7,
=(20-7.2)×5.7,
=12.8×5.7,
=72.96.
点评:这类型的题目先观察算式特点,看能不能运用简便运算的方法简算,若不能就要按照运算法则运算.
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