4-2 1/4*(1 1/3-5/6): 10 решить по заранее

4 - 2 1/4 * (1 1/3 - 5/6) : 10 = 3 71/80

1) 1 1/3 - 5/6 = 1 2/6 - 5/6 = 8/6 - 5/6 = 3/6
2) 2 1/4 * 3/6 = 9/4 * 3/6 = 27/24 = 9/8
3) 9/8 : 10 = 9/8 * 1/10 = 9/80
4) 4 - 9/80 = 3 80/80 - 9/80 = 3 71/80