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8.6×10.1                   
5.6×(12.5-8.5÷0.85)
[(8.1-5.6)×0.9-1]×0.4            
8.25×4.08+0.75×4.08+4.08
1.84÷[(28.02+11.98)×(62.8-62.3)].
分析:根据小数四则混合运算和运算定律与简便运算进行计算.小数的四则混合运算同整数的四则混合运算相同,不同之处在于小数点的位置移动.有公因式的利用乘法分配律来进行简便计算.
解答:解:8.6×10.1=86.86;
5.6×(12.5-8.5÷0.85),
=5.6×(12.5-10),
=5.6×2.5,
=14;
[(8.1-5.6)×0.9-1]×0.4,
=(2.5×0.9-1)×0.4,
=1.25×0.4,
=0.5;
8.25×4.08+0.75×4.08+4.08,
=4.08×(8.25+0.75+1),
=4.08×10,
=40.8;
1.84÷[(28.02+11.98)×(62.8-62.3)]
=1.84÷(40×0.5)
=1.84÷20,
=0.092.
点评:此题考查了小数四则混合运算和运算定律与简便运算.
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