6,84:57/80dikali2 3/8

6,84 : 57/80 x 2 3/8

= (684/100 : 57/80) x 19/8

= (684/100 x 80/57) x 19/8

= (54720/5700) x 19/8

= (5472/570) x 19/8

= 2736/285 x 19/8

= 51984/2280

= 25992/1140

= 6498/285

= 22 228/285

= 22 76/95