Question

Calculati (-3pe7)+(5pe6)+(-8pe21)+(+9pe14 ) (-2pe3)+(11pe12)+(-7pe8)+(1pe6)

Answer 1

$\left(-\frac{3}{7}\right)+\left(\frac{5}{6}\right)+\left(-\frac{8}{21}\right)+\left(\frac{9}{14}\right)+\left(-\frac{2}{3}\right)+\left(\frac{11}{12}\right)+\left(-\frac{7}{8}\right)+\left(\frac{1}{6}\right)=-\frac{3}{7}+\frac{5}{6}-\frac{8}{21}+\frac{9}{14}-\frac{2}{3}+\frac{11}{12}-\frac{7}{8}+\frac{1}{6}=-\frac{72}{168}+\frac{140}{168}-\frac{64}{168}+\frac{108}{168}-\frac{112}{168}+\frac{154}{168}-\frac{147}{168}+\frac{28}{168}=\frac{35}{168}=\frac{5}{24}$