Вычисли: А) 3/5•4/5 Б) 4/7•5/8 В) 11/15•5/9 Г) (4/5)² Д) 2/3:7/11 Е) 12/25:4/5 Ж) 5/8:4 З) 6:3/8

Вычислим значения выражений:

1) 3/5 * 4/5 = (3 * 4)/(5 * 5) = 12/25;

2) 4/7 * 5/8 = (4 * 5)/(7 * 8) = (2 * 2 * 5)/(7 * 2 * 2 * 2) = 5/(7 * 2) = 5/14;

3) 11/15 * 5/9 = (11 * 5)/(3 * 5 * 9) = 11/(3 * 9) = 11/27;

4) (4/5)^2 = ((4)^2)/((5)^2) = 16/25;

5) 2/3 : 7/11 = 2/3 * 11/7 = (2 * 11)/(3 * 7) = 22/21 = 1 1/21;

6) 12/25 : 4/5 = 12/25 * 5/4 = (12 * 5)/(25 * 4) = (3 * 4 * 5)/(5 * 5 * 4) = 3/5;

7) 5/8 : 4 = 5/8 * 1/4 = (5 * 1)/(8 * 4) = 5/32;

8) 6 : 3/8 = 6 * 8/3 = (6 * 8)/3 = 48/3 = 16.