как решить?:
(7 1/4- 6 7/18)*7/2+ 2/8.

=(7 9/36 - 6 14/36) • 1/2 +2/8=((6 45/36 - 6 14/36) •1/2 +2/8= 31/36•• • 1/2 + 2/8 = 31/72 + 18/72 = 54/72 = 25/36