1 -1 1= 1 + +( )+12 21 1 1 1 11= 1 + + + 1 + + + ... + 1++12 22 22...

1-

1 -

1

1

= 1 +

+

( )

₊₁

2

2

1

1

1

1

11

= 1 +

+

+ 1 +

+

+ ... + 1

+

+

1

²

2

²

2

²

3

²

100

99

²²

-

+

- 1 = 0

2

S u t m: OÀN TI N TRUNG - THCS Hoàng V n Th - N

,

1

= 1,

2

= 1

=

1

2

+

2

2

2

1

+ 2

2

+ 3

( )

1

2

+1

2010

₁

₁

₂

+

=

1 +

²

1+

²

1 +

2

=

.

+ +1

=

2

( )

_{+ 1}

= 1 +

-

+ 1

1

9999

= 100 -

=

100

100

= 0

+

=

2 +1

=

1

2

=

- 1

²

+ 2

-

1

=

= 1

= -

1

= - 2

=1

= 1

( )

_-

( )

_-

( )

_{( )}

⁺

( )

_{( )}

^{= 0}

1+

²

1 +

1 +

²

1+

( ) ( )

_-

²

_{- 1 = 0}

_{= 1}

2010

. .

²

( )

.

=

¹

1

. .

²

'

'

.

=

.

+

+

+ + 2

+

1 +