Найдите значения выражения а) 1/4*4/9; б) 1/7*2 1/3; в) 2 2/5*5/6; г) (1/5+2/15) * 3/4; д) (1/2-1/3) * 6

а) 1/4 * 4/9 = (1 * 4) / (4 * 9) = 1/9;

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

в) 2 2/5 * 5/6 = 12/5 * 5/6 = (12 * 5) / (5 * 6) = (2 * 1) / (1 * 1) = 2/1 = 2;

г) (1/5 + 2/15) * 3/4 = ((3 * 1) / 15 + 2/15) * 3/4 = (3/15 + 2/15) * 3/4 = 5/15 * 3/4 = 1/3 * 3/4 = (1 * 3) / (3 * 4) = 1/4;

д) (1/2 - 1/3) * 6 = (3/6 - 2/6) * 6 = 1/6 * 6 = 6/6 = 1.