分析:(1)可先將式中的小數(shù)化為分?jǐn)?shù)后,再根據(jù)乘法分配律計(jì)算;
(2)根據(jù)根據(jù)乘法分配律計(jì)算即可;
(3)可將分?jǐn)?shù)化為小數(shù),再按四則混合運(yùn)算的順序進(jìn)行;
(4)根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可,先算除法,再算加法和減法.
解答:解:(1)
×0.25+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(
+
-
)×12,
=
×12+
×12-
×12,
=9+22-6.5,
=24.5;
(3)3
×8-3
+3×7.5,
=3.75×8-3.75+3×7.5,
=3.75×(8-1)+3×7.5,
=3.75×7+3×7.5,
=26.25+22.5,
=48.75;
(4)863+47.95÷0.35-529,
=863+137-529,
=1000-529,
=471.
點(diǎn)評(píng):當(dāng)算式中同時(shí)含有分?jǐn)?shù)與小數(shù)時(shí),要根據(jù)式中數(shù)據(jù)的特點(diǎn)靈活將它們互化后再進(jìn)行計(jì)算.