12-х-у=12-5 3/4 - 7/12 = (12-5) -(3/4+7/12)=7- (9/12+7/12)=7-16/12= =7-4/3=7-1 1/3= 7-1-1/3=6-1/3=5 2/3
12-х-у=12-5 3/4 - 7/12 = (12-5) -(3/4+7/12)=7- (9/12+7/12)=7-16/12= =7-4/3=7-1 1/3= 7-1-1/3=6-1/3=5 2/3