1/4+2/4+3/4+1/5+2/5+3/5+4/5+.1/9+2/9+3/9.+8/9
=(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+……+(1/9+2/9+3/9.+8/9)
=(1+2/4)+2+(2+3/6)+3+(3+4/8)+4
=9+(6+1/2+1/2+1/2)
=33/2
1/4+2/4+3/4+1/5+2/5+3/5+4/5+.1/9+2/9+3/9.+8/9
=(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+……+(1/9+2/9+3/9.+8/9)
=(1+2/4)+2+(2+3/6)+3+(3+4/8)+4
=9+(6+1/2+1/2+1/2)
=33/2