考點(diǎn):小數(shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算,分?jǐn)?shù)的四則混合運(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)數(shù)字特點(diǎn),把64看作8×4×2,運(yùn)用乘法交換律和結(jié)合律簡(jiǎn)算;
(2)先把除以4換算為乘法,然后根據(jù)乘法分配律進(jìn)行簡(jiǎn)算即可;
(3)可以先加
,再減去
,然后再根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(4)先算小括號(hào)內(nèi)面的,然后根據(jù)運(yùn)算順序計(jì)算;
(5)按照分?jǐn)?shù)四則運(yùn)算順序來做,先算小括號(hào)內(nèi)的,然后算中括號(hào)內(nèi)的,最后算中括號(hào)外面的.
解答:
解:(1)64×0.125×0.25
=8×4×2×0.125×0.25
=8×0.125×(0.25×4)×2
=1×1×2
=2;
(2)27×25%+13÷4
=27×
+13×
=(27+13)×
=10;
(3)
-
+
-
=
+
)-(
+
)
=1-
=
;
(4)
-(
+
)÷
=
-
×
=
-=
-
=
;
(5)
×[(
+
)÷
]
=
×[
×
]
=
×
=
.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.