解:(1)2-
×
-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(2)
×4+
×5,
=
×(4+5),
=
×9,
=2;
(3)(
+
-
)×24,
=
×24+
×24-
×24,
=8+6-4,
=14-4,
=10;
(4)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
÷(
+
),
=
÷
,
=
;
(6)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=
;
(7)
×
+
÷
,
=
+
,
=
;
(8)
×
÷
,
=
×
×
,
=
;
(9)
+
÷
+
,
=
+
+
,
=(
+
)+
,
=1+
,
=1
.
分析:(1)先算乘法,再根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算,
(2)運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算,
(3)運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算,
(4)把除以7化成乘以
,再運(yùn)用乘法的分配律進(jìn)行簡(jiǎn)算,
(5)先算小括號(hào)里的加法,再算括號(hào)外的除法,
(6)先算小括號(hào)里的加法,再算中括號(hào)里的減法,最后算括號(hào)外的除法,
(7)先同時(shí)計(jì)算乘法算式和除法算式,再算加法,
(8)把除法化成乘法,約分計(jì)算即可,
(9)先算除法,再運(yùn)用加法的交換律、結(jié)合律進(jìn)行簡(jiǎn)算.
點(diǎn)評(píng):此題考查了分?jǐn)?shù)四則混合運(yùn)算的順序,注意能運(yùn)用運(yùn)算定律簡(jiǎn)算的一定要進(jìn)行簡(jiǎn)算.