9/8*(2 1/4)²-3/7 : 3 3/7+5/6 :3 1/3=9/8*81/16-3/7 : 24/7+5/6 :10/3= 11 3/128
1) 9/8×81/16=9 * 81/8 *16=729/128 = 5 89/128
2) 3/7 : 24/7=3/7 * 7/24 =3*7/7*24 = 21/168=1/8
3) 5/6 : 10/3 = 5/6 * 3/10 = 5*3/6*10 = 15/60 = 1/4
4) 5 89/128 - 1/8 = 5 73/128
5) 5 73/128 + 1/4= 11 3/128