考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,整數(shù)四則混合運(yùn)算,小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)先算除法,再算乘法,最后算加法;
(2)先算乘法和除法,再算減法;
(3)根據(jù)乘法交換律進(jìn)行簡算;
(4)根據(jù)乘法分配律進(jìn)行簡算;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)先算除法,再算減法,再算乘法,最后算加法.
解答:
解:(1)1375+164÷8×25
=1375+20.5×25
=1375+512.5
=1887.5;
(2)25.3×12-33.46÷0.35
=303.6-95.6
=208;
(3)
÷
×
=
×
÷
=
÷
=
;
(4)9×0.125×12-9×0.125×4
=9×0.125×(12-4)
=9×0.125×8
=9×(0.125×8)
=9×1
=9;
(5)
÷
+87.25×
=
×
+87.25×
=(
+87.25)×
=100×
=75;
(6)
×(5-
÷4)+
=
×(5-
)+
=
×
+
=40+
=44
.
點(diǎn)評:考查了運(yùn)算定律與簡便運(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)算定律簡便計(jì)算.