Умоляю помогите заранее СПАСИБО

1) (6.83 + 3.17) + (7.81 + 8.19) = 26
2) 527 + (925-825) = 627
3) $(\frac{2}{19} * \frac{19}{1}) * 13 \frac{5}{100}$ = 2610
4) $\frac{3}{11} * \frac{11}{3} * ( \frac{21}{17} * \frac{17}{21}) = 1$
5) $7\frac{1}{4} + 15 \frac{3}{4} + (13 \frac{7}{8} + 17 \frac{1}{8}) = 54$
6) (-5.37+(-4.37)) + 9.29 = (-0.45)
7) $(\frac{28}{1}* \frac{5}{14}) * 3.9 = 39$
8) $((- \frac{7}{31})* \frac{31}{7}) * ((- \frac{2}{13}) * (- \frac{13}{20})) = - \frac{1}{10}$