考點(diǎn):分?jǐn)?shù)的簡(jiǎn)便計(jì)算
專題:運(yùn)算定律及簡(jiǎn)算
分析:(1)(2)應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(3)先把原式變?yōu)椋?4-1)×
,再應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(4)先把除法化為乘法,再應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(5)先計(jì)算小括號(hào),再應(yīng)用乘法分配律簡(jiǎn)便計(jì)算;
(6)先算乘法再算減法.
解答:
解:(1)36×(
++)
=36×
+36×
+36×
=9+6+4
=19;
(2)(
+-)24
=24×
+24×
-24×
=8+6-1
=13;
(3)43×
=(44-1)×
=44×
-1×
=3-
=
;
(4)
×+÷1=
×+
×=
×(
+
)
=
×1
=
;
(5)[1-(
+)]÷
=(1-
-
)×4
=(
-
)×4
=
×4-
×4
=3-
=
;
(6)1-
×
=1-
=
.
點(diǎn)評(píng):此題主要考查分?jǐn)?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.