(2/3-1/2+1/6)1/24
=2/3*24-1/2*24+1/6*24
=16-12+4
=8
1/3+1/15+1/35+1/63
=(1-1/2+1/2-1/5+1/5-1/7+1/7-1/9)÷2
=(1-1/9)÷2
=8/9÷2
=4/9
(2/3-1/2+1/6)1/24
=2/3*24-1/2*24+1/6*24
=16-12+4
=8
1/3+1/15+1/35+1/63
=(1-1/2+1/2-1/5+1/5-1/7+1/7-1/9)÷2
=(1-1/9)÷2
=8/9÷2
=4/9