Сложитеидроби 5/18+1/12
5/18+1/12=13+12/144=25/144
5/18 + 1/12 = 20/72 + 6/72 = 26/72 = 13/36
7/12+2/9
решите
7/12 + 2/9 = 21/36 + 8/36 = 29/36