解:(1)5×6.6+7.5×6.6,
=(5+7.5)×6.6,
=12.5×6.6,
=82.5;
(2)
×24,
=
×(23+1),
=
,
=11
,
=
;
(3)24×(
-
+
),
=24×
24×
24×
,
=16-6+10,
=20;
(4)
÷3.25+
,
=
,
=
,
=
,
=
,
=
;
(5)
+
÷3.75,
=
,
=
,
=
+
,
=
,
=
,
=
.
分析:(1)5×6.6+7.5×6.6,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(2)
×24,轉(zhuǎn)化為:
×(23+1),再運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(3)24×(
-
+
),運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(4)
÷3.25+
,把小數(shù)化成分?jǐn)?shù),再根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序和分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
(5)
+
÷3.75,把小數(shù)化成分?jǐn)?shù),再根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序和分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算.
點(diǎn)評(píng):此題考查的目的是掌握小數(shù)、分?jǐn)?shù)四則混合運(yùn)算的運(yùn)算順序和它們的計(jì)算法則,能夠靈活選擇簡(jiǎn)便方法進(jìn)行計(jì)算.