Вправи 301 - 401 » 398

Розв’яжи рівняння. 42 : p = 7 р = 42 : 7 р = 6____ 42 : 6 = 7 7 = 7 100 – c = 69 с = 100 – 69 с = 100 – 70 + 1 с = 31______ 100 – 31 = 69 100 – 30 – 1 = 69 69 = 69 54 + m = 72 m = 72 – 54 m = 72 – 52 – 2 m = 18_____ 54 + 18 = 72 54 + 20 – 2 = 72 72 = 72