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Ответы на все примеры с доски:

1. \(3\frac23+2\frac23=6\frac13\)

2. \(17-13\frac25=3\frac35\)

3. \(13\frac34=\frac{55}{4}=13,75\)

4. \(\frac16+\frac14=\frac5{12}\)

5. \(\frac78+\frac3{10}=1\frac7{40}\)

6. \(\frac2{14}-\frac4{21}=-\frac1{21}\)

7. \(\frac{11}{60}-\frac{13}{60}=-\frac1{30}\)

8. \(4\frac38-2\frac9{10}=1\frac{19}{40}\)

9. \(1\frac7{10}-2\frac{14}{15}=-1\frac7{30}\)

10. \(\frac5{32}-\frac7{48}=\frac1{96}\)

11. \(\frac7{15}+\frac49=\frac{41}{45}\)

12. \(\frac9{40}+\frac3{18}-\frac5{16}=\frac{19}{240}\)

13. \(\frac{24}{36}-\frac5{21}+\frac{10}{27}=\frac{151}{189}\)

14. \(8\frac12+10\frac34-1\frac23=17\frac7{12}\)

15. \(\frac7{32}+\frac5{24}=\frac{41}{96}\)