(1)2011×
(2)(
(3)
(4)
(5)2009÷2009
(6)
|
(1)2011×
+1004×2009 2010
,1004 1005
=(2010+1)×
+(1005-1)×2009 2010
,1004 1005
=2010×
+2009 2010
+1005×2009 2010
-1004 1005
,1004 1005
=2009+
+1004-2009 2010
,2008 2010
=3013+
,1 2010
=3013
;1 2010
(2)(
x-9)×1 2
=x-9,1 5
(
x-9)×1 2
×5=(x-9)×5,1 5
x-9=5x-45,1 2
x-9+9=5x-45+9,1 2
x=5x-36,1 2
x-1 2
x=5x-36-1 2
x,1 2
4
x-36=0,1 2
4
x-36+36=0+36,1 2
x=36,9 2
x×9 2
=36×2 9
,2 9
x=8;
(3)
+1 2
+5 6
+11 12
+…+19 20
,109 110
=1-
+1-1 2
+1-1 6
+1-1 12
+…+1-1 20
,1 110
=1+1+…+1-(
+1 2
+1 6
+1 12
+…+1 20
),1 110
=10-(1-
+1 2
-1 2
+1 3
-1 3
+…+1 4
-1 10
),1 11
=10-(1-
),1 11
=10-1+
,1 11
=9
;1 11
(4)
+573+697×572 573×697-124
,363636 727272
=
+573+697×(573-1) 573×697-124
,36×10101 72×10101
=
+573×697-124 573×697-124
,1 2
=1+
,1 2
=1
;1 2
(5)2009÷2009
+20092009 2010
,1 2011
=2009÷
+2009+2010×2009+2009 2010
,1 2011
=2009×
+2009+2010 2009×2011
,1 2011
=
+2010 2011
+2009,1 2011
=1+2009,
=2010;
(6)
+2 1×7
+2 7×13
+…+2 13×19
,2 145×151
=
×(1 3
+6 1×7
+6 7×13
+…+6 13×19
)6 145×151
=
×(1-1 3
+1 7
-1 7
+1 13
-1 13
+…1 19
-1 145
)1 151
=
×(1-1 3
)1 151
=
×1 3
,150 151
=
.50 151