вычеслите
1.3/35:1.20/56-3.5/21:1.22/63

1,3/ 35  / 1,20/56 -3,5/21  / 1,22/63 1,3/35=13/10 /35= 13/3501,2/56 =12/10 /56=3/14013/350  /3/140 = 26/153,5/21= 35/10 /21 = 1/61,22/63 = 122/100 /63 = 122/63001/6  / 122/6300 =525/6126/15 - 525/61 =1586/915 - 7875/915 = -6289 /915 = 6 799/915