Вычисли удобным способом: 420: (10 * 7) = 7 5400: (100*3) = ? 7200: (9*4) = ?

Вычислим удобным способом:

1) 420 : (10 * 7) = (42 * 10) / (10 * 7) = (42 * 1) / (1 * 7) = 42/7 = (6 * 7) / 7 = 6 * 1/1 = 6/1 = 6;

2) 5400 : (100 * 3) = (54 * 100) / (100 * 3) = (54 * 1) / (1 * 3) = 54/3 = 18 * 3/3 = 18 * 1/1 = 18/1 = 18;

3) 7200 : (9 * 4) = (9 * 800) / (9 * 4) = (1 * 800) / (1 * 4) = 800/4 = 200 * 4/4 = 200 * 1/1 = 200/1 = 200.