解:(1)
,
=
,
=
,
=1001;
(2)
,
=
-
+
-
-
+
-
+
-
+
-
,
=1-
,
=
;
(3)
,
=(2007-1)×
,
=2007×
-
,
=2008-
,
=2008-(1+
),
=2007-
,
=2006
;
(4)97×2010-96×2011,
=(96+1)×2010-96×2011,
=96×2010+2010-96×2011,
=2010-(2011-2010)×96,
=2010-96,
=1914;
(5)(2890+
+
+
)÷(
+
+
),
=2890÷(
+
+
)+1,
=2890÷(
+
+
)+1,
=2890×120÷(100+105+84)+1,
=2890×120÷289+1,
=2890÷289×120+1,
=10×120+1,
=1201.
分析:(1)此題屬于同分母分?jǐn)?shù)的加法計(jì)算,只把分子相加,分母不變.分母相加時(shí),運(yùn)用高斯求和公式簡(jiǎn)算,然后通過約分,求出結(jié)果;
(2)通過觀察,每個(gè)分?jǐn)?shù)都可以拆成兩個(gè)分?jǐn)?shù)相減的形式,然后通過分?jǐn)?shù)加、減抵消的方法,求得結(jié)果;
(3)把2006寫成(2007-1),把除法改為乘法,運(yùn)用乘法分配律簡(jiǎn)算;
(4)把97看做96+1,運(yùn)用乘法分配律簡(jiǎn)算;
(5)運(yùn)用除法的性質(zhì)簡(jiǎn)算.
點(diǎn)評(píng):完成此題,應(yīng)注意觀察,運(yùn)用所學(xué)的定律或性質(zhì)以及運(yùn)算技巧,進(jìn)行巧妙解答.