Вправи 601 - 750 » 654-655

654. Обчисли: 52 = 25; 62 = 36; 72 = 49; 82 = 64; 92 = 81; 02 = 0; 16 = 1; 34 = 3 • 3 • 3 • 3 = 9 • 9 = 81; 25 = 2 • 2 • 2 • 2 • 2 = 4 • 4 • 2 = 32. 655. Виконай дії: а) 32 + 13 = 9 + 1 = 10; 92 + 19 = 81 + 19 = 100; 72 – 9 = 49 – 9 = 40; 24 – 42 = 16 – 16 = 0. б) 23 + 12 = 8 + 12 = 20; 33 – 23 = 27 – 8 = 19; 33 : 3 = 32 = 9; 42 : 8 = 16 : 8 = 2.