12 13/20-(86 9/2-3 3/4:3)*2 2/5 помогите пожалуйсто
12 13/20 - (86 9/2 - 3 3/4 / 3) * 2 2/5 = 253/20 - (181/2 - 15/3 / 3) * 12/5 = 253/20 - (181/2 - 5/3) * 12/5 = 253/20 - (543 /6 - 10/6 ) * 12/5 = 253/20 -533/6 *12/5 = 253/20 -1066/5 = 253/20 - 4264/20 = -4011 /20 = - 200 11/20