(1/2+1/3)*2=?(1/2-1/3)*3=?(1/4+1/6):10=?(5/6-1/4):7=?

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

(1/2 - 1/3) * 3 = (3 - 2)/6  * 3 = 1/6 * 3 = 1/2;

(1/4 + 1/6) : 10 = (6 + 4)/24 : 10 = 10/24 : 10 = 1/24;

(5/6 -1/4) : 7 = (20 - 6)/24 :7 = 14/24 : 7 = 2/24 = 1/12 - уменьшаем дробь на 2.