ПОМОГИТЕ СРОЧНО С ДРОБЯМИ ПЖ 1 1/7 *(1/3+1/8+5/12)-1/5+1/10= (первое) (2-3/4)*(2/3-2/5)= (второе)

1 1/7 * (1/3 + 1/8 + 5/12) - 1/5 + 1/10 = 9/10.1) 1/3 + 1/8 + 5/12 = (1*8 + 1*3 + 5*2)/24 = 21/24 = 7/8 ;2) 1 1/7 * 7/8 = 8/7 * 7/8 = 1 ;3) 1 - 1/5 = 5/5 - 1/5 = 4/5 ;4) 4/5 + 1/10 = (4*2 + 1*1)/10 = 9/10.Ответ : 9/10.(2 - 3/4) * (2/3 - 2/5) = 1/3.1) 2 - 3/4 = 8/4 - 3/4 = 5/4 = 1 1/4 ;2) 2/3 - 2/5 = (2*5 - 2*3)/15 = 4/15 ;3) 1 1/4 * 4/15 = 5/4 * 4/15 = 1/3.Ответ : 1/3.