4intreg 4/5=(5x4+4)/5=24/5
5intreg1/2=(2x5+1)/2=11/2
8intreg1/11=(11x8+1)/11=89/11
1intreg1/8=(8x1+1)/8=9/8
18intreg2/9=(9x18+2)/9=164/9
36: 24/5 + (11/2 x89/11 - 9/8 x 164/9) x2/5=
36x5/24 + (89/2 -41/2) x2/5=
15/2 + 48/2 x2/5=
15/2 + 48/5=(15x5)/10 + (48x2)/10=75/10 + 96/10=171/10