18•(11/12-8/9):(5/14+2/7)=.... Помогите решить пожалуйста .
18 * (11/12 - 8/9) : (5/14 + 2/7) = 7/9 1) 11/12 - 8/9 = 33/36 - 32/36 = 1/36 2) 5/14 + 2/7 = 5/14 + 4/14 = 9/14 3) 18 * 1/36 = 18/36 = 1/2 4) 1/2 : 9/14 = 1/2 * 14/9 = (1*7)/(1*9) = 7/9