1 1 1 1 1 1 1 1 1 1   3 5 99 2 4 6 100 51 52 100HD

1 ... 2 ...

Ta có : 1 1 1 1 1 1 1 1 1

VT = + + + + +    +    −    + + + +   

2 3 4 99 100 2 4 6 100

1 1 1 1 1 1 1 1 1 1

VT = + + + + +          − + + + +    = + + + = VP