分析:(1)先通分,再按照從左到右的順序計(jì)算;
(2)運(yùn)用加法結(jié)合律簡(jiǎn)算;
(3)運(yùn)用加法交換律簡(jiǎn)算;
(4)先算小括號(hào)里面的減法,再算括號(hào)外的加法;
(5)根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算;
(6)先算括號(hào)里面的減法,再算括號(hào)外的減法;
(7)先去掉括號(hào),再計(jì)算;括號(hào)外是減號(hào),所以去括號(hào)時(shí)要改變括號(hào)內(nèi)的運(yùn)算符合;
(8)先根據(jù)連續(xù)減去兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和簡(jiǎn)算,再運(yùn)用加法交換律簡(jiǎn)算.
解答:解:(1)
+
+
,
=
+
+
,
=
+,
=
;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)
+
-
,
=
-
+
,
=
+
,
=
;
(4)
+(
-
),
=
+
,
=
;
(5)10-
-
,
=10-(
+
),
=10-1,
=9;
(6)
-(
-
),
=
-
,
=
;
(7)
-(
-
),
=
-
+
,
=0
+,
=
;
(8)
-(
+
),
=
-
-
,
=
-
-
,
=
-
,
=
.
點(diǎn)評(píng):運(yùn)算定律是常用的簡(jiǎn)便運(yùn)算的方法,要熟練掌握,靈活運(yùn)用.