S.O.S. с примером 8/9*3/4-(5/6-1/4)=?

Question

S.O.S. с примером 8/9*3/4-(5/6-1/4)=?

Answer 1

8/9*3/4-(5/6-1/4)
1) 5/6-1/4=2*5/2*6-3*1/3*4=10/12-3/12=7/12
2) 8/9*3/4=8*3/9*4=24/36=2*12/3*12=2/3
3) 2/3-7/12=4*2/4*3-7/12=8/12-7/12=1/12

Answer 2

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