Kak reshit 3 3/8:(1/14x 5/7)=2,1
3 3/8:(1/14x + 5/7)=2,12,1 = 2 1/10 1/14х + 5/7 = 3 3/8 : 2 1/10 1/14х + 5/7 = 1 17/28 1/14х = 1 17/28 - 5/7 1/14х = 25/28 х = 25/28 : 1/14 х = 12,5