Условие:

843
43 + 718
72 + (6460)

843 = (80 + 4) − 3 = 80 + (43) = 8 + 1 = 81
43 + 718 = 5018 = 50 − (10 + 8) = 50108 = 408 = 32
72 + (6460) = 72 + 4 = 76