решите по действиям:
а)3 1/9-(3.5+2 1/9)
б)1 5/14-(1 2/7-2 9/14)

а)3 1/9-(3.5+2 1/9) = -2 1/2     3,5 + 2 1/9= 3 5/10 + 2 1/9 = 5 + (5/10+1/9) = 5 +(1/2+1/9)= 5 + (9/18+2/18)= 5 11/18 3 1/9 - 5 11/18 = 3 2/18 - 5  11/18= -2 9/18= -2 1/2б)1 5/14-(1 2/7-2 9/14) =  2 5/7     1 2/7-2 9/14 = 1 4/14 - 2 9/14 = - 1 5/14   1 5/14 - (-1 5/14) = 1 5/14 + 1 5/14 = 2 10/14= 2 5/7