考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(2)根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)先算除法,再算減法;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)先算減法,再算乘法,最后算除法.
解答:
解:(1)900-157-343
=900-(157+343)
=900-500
=400;
(2)907÷0.25÷4
=907÷(0.25×4)
=907÷1
=907;
(3)1-
÷
=1-
=
;
(4)36×
=(35+1)×
=35×
+1×
=27+
=27
;
(5)
×
+
÷5
=
×
+
×
=(
+
)×
=
×
=
;
(6)1÷[
×(
-
)]
=1÷[
×
]
=1÷
=36.
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)算定律簡(jiǎn)便計(jì)算.