[latex]2,48-3 \frac{3}{4} -7 \frac{1}{3} +3,52-5 \frac{1}{4} +3 \frac{7}{4} =[/latex]

[latex]= (2,48+3,52)+(-3 \frac{3}{4}-5 \frac{1}{4}+4 \frac{3}{4})-7 \frac{1}{3}=6-4 \frac{1}{4} -7 \frac{1}{3}=[/latex] =[latex] -5 \frac{1}{4}- \frac{1}{3}=- \frac{21}{4}- \frac{1}{3}= -\frac{63+4}{12}= -\frac{67}{12}=-5 \frac{7}{12} [/latex]