解:57.5-4.25-15.75
=57.5-(4.25+15.75),
=57.5-20,
=37.5;
(2)4.82-5.2÷0.8×0.6
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(3)
×16.31-2.31÷
=
×16.31-2.31×
,
=
×(16.31-2.31),
=
×14,
=10;
(4)6760÷13+17×25
=520+425,
=945;
(5)1.25×32×2.5
=(1.25×8)×(4×2.5),
=10×10,
=100;
(6)35÷
×(1-
)
=40×
,
=28
.
分析:(1)把原式改寫(xiě)為57.5-(4.25+15.75)然后再按照小數(shù)四則混合運(yùn)算的運(yùn)算方法進(jìn)行計(jì)算即可;
(2)(4)直接按照小數(shù)、整數(shù)四則混合運(yùn)算的運(yùn)算方法進(jìn)行計(jì)算即可得到答案;
(3)把原式改寫(xiě)為
×16.31-2.31×
,然后再按照乘法分配律進(jìn)行計(jì)算即可得到答案;
(4)把原式改寫(xiě)為1.25×8×4×2.5,然后再根據(jù)乘法交換律進(jìn)行計(jì)算即可得到答案;
(6)按照分?jǐn)?shù)四則混合運(yùn)算的運(yùn)算方法進(jìn)行計(jì)算即可得到答案.
點(diǎn)評(píng):此題主要考查的是整數(shù)、小數(shù)、分?jǐn)?shù)的四則混合運(yùn)算的運(yùn)算方法和簡(jiǎn)便運(yùn)算的靈活應(yīng)用.