Ngày tải lên :
23/11/2013, 14:11
... x
+
+ + + + +
+ + + +
+ + + + + +
( )
2
2 2 2 2
4 4
4 4
4 4 4
4 4 4 2
1, (1 ) 4 (1 ) 2, 8 36
3, 4 4, 64
5, 64 1 6, 81 4
7, 4 81 8, 64
9, 4 10,
x x x x
x x
x x
x x y
x y x x
+ +
+ +
+ +
+ ... Ch¼ng h¹n, víi n = 4 th× :
(a + b)
4
= a
4
+ 4a
3
b + 6a
2
b
2
+ 4ab
3
+ b
4
vµ víi n = 5 th× :
(a + b)
5
= a
5
+ 5a
4
b + 10a
3
b
2
+ 10a
2
b
3
+ 10ab
4
+ b
5
2
2
1
)4) (3)(2)(1()3)(2)(1.(3)2)(1.(30
31.2.3.2.3.336
,31.2.6
,00
0
44
33
22
11
0
=++=
=+=
==
==
=
bb
bb
bb
bb
b
Vy, ... 5
5 4 5
8 7 5 4
5 10 5
1, 1 2, 1
3, 1 4, 1
5, 1 6, 1
7, 1 8, 1
x x x x
x x x x
x x x x
x x x x
+ + + +
+ + + +
+ +
+ + +
2 2 2 2 2 2 2
2 2 4
4
1, ( 4) ( 6)( 10) 128 2, ( 1)( 2)( 3)( 4) 24
3,...