解:(1)5-
-
,
=5-(2
),
=5-3,
=2;
(2)71×99,
=71×(100-1),
=71×100-71,
=7100-71,
=7029;
(3)0.625×0.5+
+
×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×(
+
-0.6),
=45×
+45×
-45×0.6,
=35+12-27,
=20;
(6)0.25×48,
=(0.25×4)×12,
=1×12,
=12.
分析:(1)5-
-
,應(yīng)用減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
(2)71×99,轉(zhuǎn)化為71×(100-1),應(yīng)用乘法分配律進(jìn)行簡(jiǎn)算;
(3)0.625×0.5+
+
×62.5%,把
和62.5%都化成小數(shù),再應(yīng)用乘法分配律進(jìn)行簡(jiǎn)算;
(4)8.37-3.25-(1.37+1.75),應(yīng)用減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
(5)45×(
+
-0.6),應(yīng)用乘法分配律進(jìn)行簡(jiǎn)算;
(6)0.25×48轉(zhuǎn)化為0.25×4×12,應(yīng)用乘法結(jié)合律進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):此題考查的目的是靈活運(yùn)用運(yùn)算定律、運(yùn)算性質(zhì)對(duì)整數(shù)、小數(shù)、分?jǐn)?shù)四則混合運(yùn)算進(jìn)行簡(jiǎn)便計(jì)算.