Решите (2 2/3 - -4 3/4) * 19,2

(2 2/3 - 4 3/4) * 19,2 = - 401) 2 2/3 - 4 3/4 = 2 8/12 - 4 9/12 = - (4 9/12 - 2 8/12) = - 2 1/122) - 2 1/12 * 19,2 = - 25/12 * 19,2 = - 25 * 19,2 : 12 = - 40 Пояснения:2/3 = (2*4)/(3*4) = 8/12 - доп.множ. 43/4 = (3*3)/(4*3) = 9/12 - доп.множ. 32 1/12 = (2*12+1)/12 = 25/12