Question

помогите пожалуйста

Answer 1

$( frac{3}{4}- frac{1}{6}i)( frac{6}{7}+ frac{8}{3}i)= frac{3}{4} frac{6}{7}+ frac{3}{4} frac{8}{3}i- frac{1}{6} frac{6}{7}i- frac{1}{6} frac{8}{3} i^{2}= frac{9}{14}+2i- frac{1}{7}i- frac{4}{9}*(-1)=$$frac{9}{14}+ frac{4}{9}+(2-frac{1}{7})i=frac{9*9+4*14}{14*9}+1frac{6}{7}i=frac{137}{126}+1frac{6}{7}i=1frac{11}{126}+1frac{6}{7}i$