*3/2*5, 5*7/3*5, 3*7\6*5 , 9*5\7*3

Найдем значения выражений и сократи дроби. Получаем:

1) (5 * 3)/(2 * 5) = (1 * 3)/(2 * 1) = 3/2 = 1.5; 

2) (5 * 7)/(3 * 5) = (1 * 7)/(3 * 1) = 7/3;

3) (3 * 7)/(6 * 5) = (3 * 7)/(2 * 3 * 5) = (1 * 7)/(2 * 1 * 5) = 7/(2 * 5) = 7/10; 

4) (9 * 5)/(7 * 3) = (3 * 3 * 5)/(7 * 3) = (1 * 3 * 5)/(7 * 1) = (3 * 5)/7 = 15/7.