5/2+8/3+8/5
=5/2+(8/3+8/5)
=5/2+1
=1又5/2
9/4+16/1+16/5+9/2
=(9/4+9/2)+(16/1+16/5)
=3/2+8/3
=24/9+24/16
=24/259/4+16/1+16/15+9/2=(9/4+9/2)+(16/1+16/15)
=3/2+1
=1又3/2
采纳吧