Question

calculati: b) (-2pe9+5pe6)ori(-3pe11)+(-7pe36)ori(15pe7) va rog

Answer 1

$b)(- \frac{2}{9}+ \frac{5}{6})*(- \frac{3}{11})+(- \frac{7}{36})*( \frac{15}{7})= \frac{-12+45}{54}*(- \frac{3}{11})+(- \frac{7}{36})*( \frac{15}{7})=\\ =\frac{33}{54}*(- \frac{3}{11})- \frac{15}{36}= -\frac{1}{6}- \frac{15}{36}= \frac{-6-15}{36}=-\frac{21}{36}=- \frac{7}{12}$