Вычислить.(1/8+2/9-1/4)*5 1/7:(7/9-2/3+1/6)

(1/8 + 2/9 - 1/4) * 5 =((9*1+8*2)/8*9) - 1/4) * 5 =(25/72 - 1/4) * 5 = ((25*4-1*72)/ 72) * 5 = 7/72 * 5 =7/72*5/1 = 35/72 1/7 : (7/9 - 2/3 + 1/6) =1/7 : (( (7- 2*3)/9) + 1/6) =1/7 : ( 1/9 + 1/6) =1/7 : ((6+9) / 9*6) = 1/7 : 15/54 =1/7 * 54/15 = 18/35