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E Urgent va roooog!!


1/(1*2)+1/(2*3)+1/(3*4)+....1*(199*200


Răspuns :

1/(1*2)=1/1-1/2
1/(2*3)=1/2-1/3
1/(3*4)=1/3-1/4
....
1*(199*200)=1/199-1/200

1/(1*2)+1/(2*3)+1/(3*4)+....1*(199*200)=1/1-1/200=(200-1)/200=199/200