Question

3/2-5/6+7/12-9/20+11/30-13/42+15/56求解答

Answer 1

=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/-1/6-1/7+1/7+1/8
=1+1/8
=9/8