8/9×3/4-(5/6-1/4); 3/5+4/5×3/7+6/7; (2/5-2/7):2/7×2/5; (5/6-3/10):(3/10+2/15)

Question

8/9×3/4-(5/6-1/4); 3/5+4/5×3/7+6/7; (2/5-2/7):2/7×2/5; (5/6-3/10):(3/10+2/15)

Answer 1

1) 2/3 - 7/12 = 1/12
2)9/5
3)4/25
4)19/30 : 10/30 = 19/10