Сторінки 21 - 40 » Стр.25 (4)

240 : х = 91 – 88 240 : х = 3 х = 240 : 3 х = 80_________ 240 : 80 = 91 – 88 3 = 3 с : (17 – 8) = 72 с : 9 = 72 с = 72 • 9 с = 648________ 648 : (17 – 8) = 72 648 : 9 = 72 72 = 72 b – 46 = 64 : 16 b – 46 = 4 b = 46 + 4 b = 50_______ 50 – 46 = 64 : 16 4 = 4 4 • b = 37 + 47 4 • b = 84 b = 84 : 4 b = 21____ 4 • 21 = 84 84 = 84 (76 – 38) + k = 42 38 + k = 42 k = 42 – 38 k = 4_____ 38 + 4 = 42 42 = 42 t – 96 : 32 = 12 t – 3 = 12 t = 12 + 3 t = 15_____ 15 – 3 = 12 12 = 12