Ответ:\(\frac34-1=\frac34-\frac44=-\frac14\).\(-2+\frac34=-\frac84+\frac34=-\frac54=-1\frac14\).\(-\frac13+2=-\frac13+\frac63=\frac53=1\frac23\).\(1-\frac47=\frac77-\frac47=\frac37\).