解:(1)3+1.5÷2.5÷4,
=3+0.6÷4,
=3+0.15,
=3.15;
(2)8-4.4×0.25,
=8-1.1,
=6.9;
(3)120+600÷24,
=120+25,
=145;
(4)
,
=
,
=27;
(5)(
-
)×11×6,
=
×11×6-
×11×6,
=60-55,
=5;
(6)
÷(
-
)÷
,
=
÷(
-
)×
,
=
÷
,
=
,
=
;
分析:(1)按照小數(shù)四則混合運(yùn)算的順序可知,先計(jì)算除法再就是加法.
(2)按照小數(shù)四則混合運(yùn)算的順序可知先計(jì)算乘法再就是減法.
(3)按照整數(shù)四則混合運(yùn)算的順序可知,先計(jì)算除法再就是加法.
(4)、(6)按照分?jǐn)?shù)四則混合運(yùn)算的順序可知,同級(jí)運(yùn)算從左向右依次計(jì)算.
(5)運(yùn)用乘法的分配律進(jìn)行計(jì)算即可.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算律簡(jiǎn)便計(jì)算.