Question

1/3.4+1/4.5+1/5.6+...+1/97.98+1/98.99

Answer 1

ko spam

Answer 2

lèm rùi mè

Answer 3

=1/3 - 1/4 +1/4-1/5 +...+1/98 - 1/99

=1/3-1/99=32/99

Answer 4

1/3.4+1/4.5+1/5.6+...+1/97.98+1/98.99

=>1/3-1/4+1/4-1/5-........-1/98+1/98-1/99

=>1/3-1/99

=>33/99-1/99=32/99