考點(diǎn):分?jǐn)?shù)的簡(jiǎn)便計(jì)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:根據(jù)各題特點(diǎn)(1)應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(2)應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(3)應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(4)把2005
看作2005+
,運(yùn)用乘法分配律簡(jiǎn)算.
(5)把原式化為238÷
再解答即可;
(6)從左到右依次算即可.
解答:
(1)17÷51+(
+
)×17
=
+
×17+
×17
=
+
+
=1
;
(2)73
×
=(73+
)×
=73×
+
×
=
+
=
;
(3)267
×
=(267+
)×
=267×
+
×
=
+
=
;
(4)2005
×
=(2005+
)×
=
+
=
=
;
(5)238÷238
=238÷
=238×
=
;
(6)7-
-
-
-
-
-
=7-
-----=7-
----=7-
---=7-
--=7-
-=7-
=
.
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)、整數(shù)、小數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.