考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算,小數(shù)四則混合運(yùn)算,分?jǐn)?shù)的拆項(xiàng)
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)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(2)根據(jù)加法交換律和結(jié)合律以及減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(4)先算加法,再根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(5)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)根據(jù)分?jǐn)?shù)的拆項(xiàng)進(jìn)行簡(jiǎn)算.
解答:
解:(1)
×
÷
×
=(
÷
)×(
×
)
=1×
=
;
(2)4.375-3
+2
-1
=(4.375+2
)-(3
+1
)
=7-5
=2;
(3)46.5×37+4.65×650-93
=46.5×37+46.5×65-46.5×2
=46.5×(37+65-2)
=46.5×100
=4650;
(4)
÷[(
+
)×
]
=
÷[
×
]
=
÷
÷
=
÷
÷
=1÷
=
;
(5)28
÷7
=(28+
)×
=28×
+
×
=4+
=4
;
(6)
+
+
+…+
=(1-
)+(
-
)+(
-
)+…+(
-
)
=1-
+
-
+
-
+…+
-
=1-
=
.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)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(jiǎn)便計(jì)算.