解题思路:(1)5-
2
14
17
-
1
3
17
,应用减法的运算性质进行简算;
(2)71×99,转化为71×(100-1),应用乘法分配律进行简算;
(3)0.625×0.5+[5/8]+[1/2]×62.5%,把[5/8]和62.5%都化成小数,再应用乘法分配律进行简算;
(4)8.37-3.25-(1.37+1.75),应用减法的运算性质进行简算;
(5)45×([7/9]+[4/15]-0.6),应用乘法分配律进行简算;
(6)0.25×48转化为0.25×4×12,应用乘法结合律进行简算.
(1)5-2
14
17-1
3
17,
=5-(2[14/17+
3
17]),
=5-3,
=2;
(2)71×99,
=71×(100-1),
=71×100-71,
=7100-71,
=7029;
(3)0.625×0.5+[5/8]+[1/2]×62.5%,
=0.625×0.5+0.625+0.5×0.625,
=0.625×(0.5+0.5+1),
=0.625×2,
=1.25;
(4)8.37-3.25-(1.37+1.75),
=8.37-1.37-(3.25+1.75),
=7-5,
=2;
(5)45×([7/9]+[4/15]-0.6),
=45×[7/9]+45×[4/15]-45×0.6,
=35+12-27,
=20;
(6)0.25×48,
=(0.25×4)×12,
=1×12,
=12.
点评:
本题考点: 运算定律与简便运算;整数、分数、小数、百分数四则混合运算.
考点点评: 此题考查的目的是灵活运用运算定律、运算性质对整数、小数、分数四则混合运算进行简便计算.