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)、(2)、(3)、(5)按照從左向右的順序進(jìn)行計(jì)算;
(4)先算小括號(hào)里面的減法,再算括號(hào)外面的減法;
(6)先算加法,再算減法;
(7)根據(jù)加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(8)根據(jù)異分母分?jǐn)?shù)的減法進(jìn)行計(jì)算;
(9)根據(jù)加法交換律進(jìn)行簡(jiǎn)算.
解答:
解:(1)
+
+
=
+
=
;
(2)
-
-
=-
-
=-
;
(3)
+
-
=
-
=
;
(4)
-(
-
)
=
-
=
;
(5)
-(
+
)
=
-
=
;
(6)
-
+
=
+
=
;
(7)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(8)
-
=
-
=
;
(9)
-1+
=
+
-1
=2-1
=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.