a ......... 3 ..... 4 ..... 6/5 .....12/11......10.......4/5.......5/6.....2/9.....20/9......18/35
b......... 2/7....5/3..... 9 ........ 8........3 x 1/3... 3/7 ....3/11.....2/3.....8/15......9/25
Inv. ..7/2....3/5......1/9.......1/8........3/10......7/3......11/3.....3/2......15/8....25/9
lui b
. . .......21/2....12/5....6/45.....12/88....30/10...28/15...55/18...6/18...300/72..450/315
a:b