Розділ 4. Дії другого ступеня » 566

1) 12 + x = 30 x = 30 – 12 x = 18_____ 12 + 18 = 30 30 = 30 2) y + 17 = 42 y = 42 – 17 y = 25____ 25 + 17 = 42 42 = 42 3) x – 20 = 32 x = 32 + 20 x = 52_____ 52 – 20 = 32 32 = 32 4) 48 – z = 13 48 – 13 = z z = 35____ 48 – 35 = 13 13 = 13 5) 20 • x = 80 x = 80 : 20 x = 4____ 20 • 4 = 80 80 = 80 6) 17 • x = 0 х = 0 : 17 x = 0____ 17 • 0 = 0 0 = 0 7) 26 : z = 26 z = 26 : 26 z = 1 8) y : 10 = 5 y = 5 • 10 y = 50