А=1/2+1/3+1/6. A=(5/6-1/4)*12/7. A=2,36-1,12-0,88+0,64. A=2/3*3/4*4/5*5/1. А=95/(12-7)(12+7). А=33²-32²/55. A=10³-9³/91?

А = 1/2 + 1/3 + 1/6 = (1 * 3 + 1 * 2 + 1 * 1)/6 = (3 + 2 + 1)/6 = 6/6 = 1;

A = (5/6 - 1/4) * 12/7 = (5 * 2 - 1 * 3)/12 * 12/7 = (10 - 3)/12 * 12/7 = 7/12 * 12/7 = 1;

A = 2,36 - 1,12 - 0,88 + 0,64 = 1;

A = 2/3 * 3/4 * 4/5 * 5/1 = 2;

А = 95 / (12 - 7)(12 + 7) = 95 / 5 * 19 = 95/95 = 1;

А = 33² - 32² / 55 = 1089 - 1024 / 55 = 65/55 = 13/11 = 1 2/11;

A = 10³ - 9³ / 91 = 1000 - 729 / 91 = 271/91 = 2 89/91.