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)把除法變?yōu)槌朔ǎ\(yùn)用乘法分配律簡算;
(2)先算小括號(hào)內(nèi)的,再算中括號(hào)內(nèi)的,最后算括號(hào)外的;
(3)把64看作65-1,運(yùn)用乘法分配律簡算;
(4)運(yùn)用乘法結(jié)合律簡算;
(5)(6)運(yùn)用乘法分配律簡算.
解答:
解:(1)
×
+
÷6
=
×
+
×
=(
+
)×
=1×
=
(2)
÷[
×(
-
)]
=
÷[
×
]
=
÷
=
×4
=
(3)64×
=(65-1)×
=65×
-
=17-
=16
(4)24×
×
=24×(
×
)
=24×
=10
(5)(
+
)×24
=
×24+
×24
=16+4
=20
(6)
×99+
=
×(99+1)
=
×100
=16
點(diǎn)評(píng):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.