进来帮我看看计算1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)+1/(9*11)+1/(11*13)

Question

进来帮我看看
计算1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)+1/(9*11)+1/(11*13)

Answer 1

原式=1/2(1/1-1/3+1/3-1/5+……+1/11-1/13)=6/13