Question

Parte intreaga din 1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)

Answer 1

1/2+1/6+1/12+1/20=

30/60+10/60+5/60+3/60=(30+10+5+3)/60=48/60=4/5=0,8

[1/2+1/6+1/12+1/20]=0 partea intreaga
{1/2+1/6+1/12+1/20}=0,8 partea fractionara