|1-1/2|+|1/3-1/2|+|1/4-1/3|+…+|1/1000-1/999|=(1-1/2)+(1/2-1/3)+(1/3-1/4)+…+(1/999-1/1000)=1-1/1000=999/1000|-√2/2+1|-|-√3-1|+|-√3|-|-√2/2| =(1-√2/2)-(√3+1)+√3-√2/2=1-√2/2-√3-1+√3-√2/2=-...