(19/12+11/18):5/72 = (114/72+44/72):5/72 = 158/72 *72/5=158/72=31целая и 3/5
(19/12+11/18):5/72=(57/36+22/36):5/72=79/36:5/72=(79*72)/(36*5)=5688/180=31,6