(3/4+1/5)+(4/5+1/6)+(5/6+1/7)+(6/7+1/8)+(7/8+1/9)+(8/9+1/10)
=3/4+1/5+4/5+1/6+5/6+1/7+6/7+1/8+7/8+1/9+8/9+1/10 =3/4+1+1+1+1+1+1/10 =5.85
(3/4+1/5)+(4/5+1/6)+(5/6+1/7)+(6/7+1/8)+(7/8+1/9)+(8/9+1/10)
=3/4+1/5+4/5+1/6+5/6+1/7+6/7+1/8+7/8+1/9+8/9+1/10 =3/4+1+1+1+1+1+1/10 =5.85