4целых 2/3-5/9*2целых 2/7

Question

4целых 2/3-5/9*2целых 2/7

Answer 1

1) 5/9*2 2/7=5/9*16/7=80/63=1 17/63;
2) 4 2/3-1 17/63=4 42/63-1 17/63=3 25/63.