Question

Va rog ajutati-ma.
Exercitiul 6
trebuie c si d.

Answer 1

$\frac{-7}{9}+ \frac{2}{5} +\frac{1}{15}- \frac{2}{45} =\frac{-7*5+2*9+1*3-2}{45}= \frac{-16}{45}\\ \\\frac{-3}{8}- \frac{1}{7} +\frac{5}{14}- \frac{3}{2}= \frac{-3*7-1*8+5*4-3*28}{56} =\frac{-93}{56}$