Вычислите (-3/14-8/21):20/21
( - 3/14 - 8/21) : 20/21 = -5/8 1) - 3/14 - 8/21 = -9 /42 - 16/42 = - 25/42 2) -25/42 : 20/21 = - 25/42 * 21/20 = = - (5*1) / (2*4) = -5/8