Giải :
= 1/2 . ( 3/1.2 - 3/2.3 + 3/2.3 - 3/3.4 + ... + 3/23.24 - 3/24.25 )
= 1/2 . ( 3/2 - 3/600 )
= 1/2 . 299/200
= 299/400
Giải:
= 1/2 . ( 3/1.2 - 3/2.3 + 3/2.3 - 3/3.4 + .... + 3/23.24 - 3/24. 25 )
= 1/2 . ( 3/2 - 3/600)
=1/2 . 299/200
= 299/400
Giải:
= 1/2 . ( 3/1.2 - 3/2.3 + 3/2.3 - 3/3.4 + .... + 3/23.24 - 3/24. 25 )
= 1/2 . ( 3/2 - 3/600)
=1/2 . 299/200
= 299/400
= 1/2 . ( 3/1.2 - 3/2.3 + 3/2.3 - 3/3.4 + .... + 3/23.24 - 3/24. 25 )
= 1/2 . ( 3/2 - 3/600)
=1/2 . 299/200
= 299/400