考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)先算減法,再算除法;
(2)根據(jù)乘法分配律進(jìn)行簡算;
(3)按照從左向右的順序進(jìn)行計(jì)算;
(4)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)先算,再算除法減法;
(7)按照從左向右的順序進(jìn)行計(jì)算;
(8)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)(
-
)÷
=
÷
=
;
(2)
×
+
×
=
×(
+
)
=
×
=
;
(3)
÷
÷
=
÷
=
;
(4)
+
+
+
=(
+
)+(
+
)
=1+2
=3;
(5)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
;
(6)20-
÷
=20-
=19
;
(7)
×8÷
=
÷
=2;
(8)7.35×99+7.35
=7.35×(99+1)
=7.35×100
=735.
點(diǎn)評: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.