Question

2pe 7 -(1-5pe7)x(13pe2-3pe4)

Answer 1

$\frac{2}{7}-(1- \frac{5}{7})*( \frac{13}{2}- \frac{3}{4})= \\ \frac{2}{7}-(\frac{7-5}{7})*(\frac{26-3}{4})= \\ \frac{2}{7}-\frac{2}{7}*\frac{23}{4}= \\ \frac{2}{7}-\frac{1}{7}*\frac{23}{2}= \\ \frac{2}{7}-\frac{23}{14}= \\ \frac{4-23}{14}=- \frac{19}{14}$

/robèrtinni