3) (83,2-80 1/6)×3/13 ​

(83,2-80 1/6)×3/13 ​= 0,7

1) 83,2- 80 1/6 = 83 2/10 - 80 1/6 = 83 6/30 - 80 5/30=3 1/30

2) 3 1/30 * 3/13 = 91/30 * 3/13 = 7/10 = 0,7