12/13=18x/39
18x*13 = 39*12
234x = 468
x = 468 : 234
x = 2
и
16/19=32:38х
38x*16 = 32*19
608x = 608
x = 1
12/13=18x/39
18x*13 = 39*12
234x = 468
x = 468 : 234
x = 2
и
16/19=32:38х
38x*16 = 32*19
608x = 608
x = 1