8分之1+15分之1+24分之1+……+143分之1
=(1/2-1/4+1/3-1/5+1/4-1/6+1/5-1/7+……+1/10-1/12+1/11-1/13)÷2
=(1/2-1/12+1/3-1/13)÷2
=(5/12+10/39)÷2
=35/52÷2
=35/104
8分之1+15分之1+24分之1+……+143分之1
=(1/2-1/4+1/3-1/5+1/4-1/6+1/5-1/7+……+1/10-1/12+1/11-1/13)÷2
=(1/2-1/12+1/3-1/13)÷2
=(5/12+10/39)÷2
=35/52÷2
=35/104