解:(1)
÷(1-
)×
,
=
÷
×
,
=
×
×
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)(
-
)÷
,
=(
-
)×8,
=
×8-
×8,
=
-
,
=
;
(4)13-13×
,
=13×(1-
),
=13×
,
=
;
(5)(
+
)×
+
,
=
×
+
×
+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
;
(6)[
-(
-
)]×
,
=[
-
]×
,
=
×
,
=
.
分析:(1)先算括號(hào)內(nèi)的,再算括號(hào)外的除法和乘法;
(2)(3)把除法改為乘法,運(yùn)用乘法分配律簡(jiǎn)算;
(4)運(yùn)用乘法分配律簡(jiǎn)算;
(5)運(yùn)用乘法分配律計(jì)算(
+
)×
,原式變?yōu)?img class='latex' src='http://thumb.zyjl.cn/pic5/latex/110760.png' />+
+
,運(yùn)用加法結(jié)合律簡(jiǎn)算;
(6)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.
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的四則混合運(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)算律簡(jiǎn)便計(jì)算.