考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,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:(1)按照從左向右的順序進(jìn)行計(jì)算;
(2)按照從左向右的順序進(jìn)行計(jì)算;
(3)先算乘法,再按照從左向右的順序進(jìn)行計(jì)算;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)先算加法,再算除法;
(7)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(8)先算減法,再算乘法,最后算除法.
解答:
解:(1)
÷
÷
=
÷
=1;
(2)
×6÷
=
÷
=5;
(3)3-
×
-
=3-
-
=2
-
=2
;
(4)(
-
)×11×7
=
×11×7-
×11×7
=55-21
=34;
(5)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×1
=
;
(6)
÷(
+
)
=
÷
=
;
(7)30×(
+
)
=30×
+30×
=5+6
=11;
(8)
÷[(
-
)×3]
=
÷[
×3]
=
÷
=
.
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.