53,4 - 4 целые 7/12:(1 2/9)²*1 целую 5/6 помогите пожалуйста))

53.4 -  4 7/12 / (1 2/9) 2 * 1 5/6 = 53 4/10 - 55/12 / (11/9)^2 * 11/6 = 53 2/5 - 55/12 / 121/81 * 11/6 = 53 2/5 - 135/44 * 11/6 = 53 2/5 - 45/8 = 53 2/5 - 5 5/8 = (53 - 5) + (2/5 - 5/8) = 48 + (16/40 - 25/40) = 48 - 9/40 = 47 31/40