4-(4 21/40-3,25):1 9/20= пожалуйста ответьте!!!!!

спасибо за ответ

4 - (4 21/40 - 3,25) : 1 9/20 = 3 целых 7/581) 4 21/40 - 3 1/4 = 4 21/40 - 3 10/40 = 1 11/402) 1 11/40 : 1 9/20 = 51/40 : 29/20 = 51/40 * 20/29 = (51*1)/(2*29) = 51/583) 4 - 51/58 = 3 58/58 - 51/58 = 3 7/58 Пояснения:0,25 = 25/100 = 1/4 - сократили на 251 11/40 = (1*40+11)/40 = 51/401 9/20 = (1*20+9)/20 = 29/20

4 - (4 21/40 - 3,25) : 1 9/20 = 4 - (181/40 - 13/4) : 29/20 = 4 - 51/40 * 20/29 = 4 - 51/2 * 1/29 = 4 - 51/58 = 181/58