分析:(1)按照分?jǐn)?shù)的四則混合運(yùn)算進(jìn)行計(jì)算即可;
(2)將
轉(zhuǎn)化成小數(shù)是0.25,25%轉(zhuǎn)化成小數(shù)是0.25,再將0.75改寫成0.25乘以3的形式,然后利用乘法分配律進(jìn)行計(jì)算即可;
(3)可將算式中的小括號(hào)去掉,然后利用乘法分配律進(jìn)行計(jì)算;
(4)根據(jù)分?jǐn)?shù)的四則混合運(yùn)算進(jìn)行計(jì)算即可.
解答:解:(1)4÷
-
÷4-4
=5-
-4
,
=4
-4
,
=0;
(2)
×2003+2005×25%+2004×0.75,
=0.25×2003+2005×0.25+2004×0.25×3,
=0.25×(2003+2005+2004×3),
=0.25×(2003+2005+6012),
=0.25×10020,
=2505;
(3)[1-(
+
)]×24
=[1-
-
]×24,
=1×24-
×24
-×24,
=24-8-6,
=10;
(4)
÷[(
+
)×
]
=
÷[
×
],
=
÷
,
=5.
點(diǎn)評(píng):此題主要考查的是分?jǐn)?shù)、小數(shù)的四則混合運(yùn)算和簡便運(yùn)算.