(1)2011×20092010+1004×10041005(2)(12x-9)×15=x-9(3)12+56+1112+1920+…+109110(4)573+697×572573×697-124+

题目简介

(1)2011×20092010+1004×10041005(2)(12x-9)×15=x-9(3)12+56+1112+1920+…+109110(4)573+697×572573×697-124+

题目详情

(1)2011×
2009
2010
+1004×
1004
1005

(2)(
1
2
x-9)×
1
5
=x-9
(3)
1
2
+
5
6
+
11
12
+
19
20
+…+
109
110

(4)
573+697×572
573×697-124
+
363636
727272

(5)2009÷2009
2009
2010
+2009
1
2011

(6)
2
1×7
+
2
7×13
+
2
13×19
+…+
2
145×151
题型:解答题难度:中档来源:不详

答案

(1)2011×class="stub"2009
2010
+1004×class="stub"1004
1005

=(2010+1)×class="stub"2009
2010
+(1005-1)×class="stub"1004
1005

=2010×class="stub"2009
2010
+class="stub"2009
2010
+1005×class="stub"1004
1005
-class="stub"1004
1005

=2009+class="stub"2009
2010
+1004-class="stub"2008
2010

=3013+class="stub"1
2010

=3013class="stub"1
2010


(2)(class="stub"1
2
x-9)×class="stub"1
5
=x-9,
class="stub"1
2
x-9)×class="stub"1
5
×5=(x-9)×5,
class="stub"1
2
x-9=5x-45,
class="stub"1
2
x-9+9=5x-45+9,
class="stub"1
2
x=5x-36,
class="stub"1
2
x-class="stub"1
2
x=5x-36-class="stub"1
2
x,
4class="stub"1
2
x-36=0,
4class="stub"1
2
x-36+36=0+36,
class="stub"9
2
x=36,
class="stub"9
2
class="stub"2
9
=36×class="stub"2
9

x=8;

(3)class="stub"1
2
+class="stub"5
6
+class="stub"11
12
+class="stub"19
20
+…+class="stub"109
110

=1-class="stub"1
2
+1-class="stub"1
6
+1-class="stub"1
12
+1-class="stub"1
20
+…+1-class="stub"1
110

=1+1+…+1-(class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+…+class="stub"1
110
),
=10-(1-class="stub"1
2
+class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+…+class="stub"1
10
-class="stub"1
11
),
=10-(1-class="stub"1
11
),
=10-1+class="stub"1
11

=9class="stub"1
11


(4)class="stub"573+697×572
573×697-124
+class="stub"363636
727272

=
573+697×(573-1)
573×697-124
+class="stub"36×10101
72×10101

=class="stub"573×697-124
573×697-124
+class="stub"1
2

=1+class="stub"1
2

=1class="stub"1
2


(5)2009÷2009class="stub"2009
2010
+2009class="stub"1
2011

=2009÷class="stub"2010×2009+2009
2010
+2009+class="stub"1
2011

=2009×class="stub"2010
2009×2011
+2009+class="stub"1
2011

=class="stub"2010
2011
+class="stub"1
2011
+2009,
=1+2009,
=2010;

(6)class="stub"2
1×7
+class="stub"2
7×13
+class="stub"2
13×19
+…+class="stub"2
145×151

=class="stub"1
3
×(class="stub"6
1×7
+class="stub"6
7×13
+class="stub"6
13×19
+…+class="stub"6
145×151

=class="stub"1
3
×(1-class="stub"1
7
+class="stub"1
7
-class="stub"1
13
+class="stub"1
13
-class="stub"1
19
+…class="stub"1
145
-class="stub"1
151

=class="stub"1
3
×(1-class="stub"1
151

=class="stub"1
3
×class="stub"150
151

=class="stub"50
151

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