Сравните (3 1/3- 1 3/4) * (3 1/3 + 1 3/4) и (3 1/3)*(3 1/3)- (1 3/4)*(1 3/4)

Упрощаем:

1) (3 1/3 - 1 3/4) * (3 1/3 + 1 3/4) = (10/3 - 7/4) * (10/3 + 7/4) = 10/3 * 10/3 - 7/4 * 7/4 = 100/9 - 49/16;

2) (3 1/3) * (3 1/3) - (1 3/4) * (1 3/4) = 10/3 * 10/3 - 7/4 * 7/4 = 100/9 - 49/16;

Сравниваем оба выражения:

100/9 - 49/16 = 100/9 - 49/16.