考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)(6)從左向右依次計(jì)算即可;
(2)根據(jù)除法的性質(zhì)計(jì)算即可;
(4)(9)根據(jù)乘法分配律計(jì)算即可;
(5)(7)首先計(jì)算小括號里面的,然后計(jì)算小括號外面的即可;
(3)(8)根據(jù)乘法交換律和結(jié)合律計(jì)算即可.
解答:
解:(1)
÷
÷
=
×=
(2)(
+
)÷
=
÷+
÷
=3
+1=
4(3)
÷0.2×
=
×
÷0.2
=0.1÷0.2
=0.5
(4)(
+
)×
=
×
+
×
=
+=
(5)(2-0.6)×
=
×=
(6)
×
÷
=
÷=
(7)
÷(
+
)
=
÷
=
(8)
×
÷
×
=
÷
×
×
=
1××=
(9)2008×
=2007×
+1×
=2006+
=2006
點(diǎn)評:此題主要考查了整數(shù)、分?jǐn)?shù)四則混合運(yùn)算,注意運(yùn)算順序,注意乘法運(yùn)算定律和除法的性質(zhì)的應(yīng)用.