解:(1)57.5-4.25-15.75,
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
(2)
÷[
×(
+
)]
=
÷[
×
],
=
÷
,
=
;
(3)
×16.31-2.31÷
=
×16.31-2.31×
,
=
×(16.31-2.31),
=
×14,
=10;
(4)(54+
)÷9,
=(54+
)×
,
=54×
+
×
,
=6+
,
=6
;
(5)9.25×9.9+92.5%,
=9.25×(10-0.1)+0.925,
=9.25×10-9.25×0.1+0.925,
=92.5-0.925+0.925,
=92.5;
(6)36÷[(
-
)×3],
=36÷[
×3-
×3],
=36÷(
-1),
=36÷
,
=24.
分析:(1)本題可以用57.5減去4.25與15.75的和,結(jié)果不變;
(2)直接用分?jǐn)?shù)的四則混合運(yùn)算進(jìn)行計(jì)算即可;
(3)可將算式中除以
改寫成乘以
,然后再利用乘法分配律進(jìn)行計(jì)算比較簡(jiǎn)便;
(4)將算式中除以9可以改寫成乘以
,然后利用乘法分配律進(jìn)行計(jì)算;
(5)可將算式中的9.9改寫成10減0.1,百分?jǐn)?shù)92.5%轉(zhuǎn)換成小數(shù),然后利用乘法分配律和小數(shù)的四則混合運(yùn)算進(jìn)行計(jì)算;
(6)先將在括號(hào)里的算式利用乘法分配律進(jìn)行計(jì)算,然后再利用分?jǐn)?shù)的四則混合運(yùn)算進(jìn)行計(jì)算即可.
點(diǎn)評(píng):此題主要考查的是分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)的四則混合運(yùn)算和簡(jiǎn)便運(yùn)算.