8/9*3/4-(5/6-1/4) 3/5+4/5*3/7+6/7 помогите пж

8/9 * 3/4 - (5/6 - 1/4) = 2/3 - 5/6 + 1/4 = 4/6 - 5/6 + 1/4 = -1/6 + 1/4 = 1/4 - 1/6=
= 6/24 - 4/24 = 2/24 = 1/12 
8/9 * 3/4 - (5/6 - 1/4) = 1/12 
1) 8/9 * 3/4 = 2/3
2) 5/6 - 1/4 =10/12 - 3/12 = 7/12
3) 2/3 - 7/12 = 8/12 - 7/12 = 1/12