Question

(3/7 * 7/5 +2/5) la puterea -1=?

Answer 1

(3/7·7/5+2/5)^-1=1/(3/7·7/5+2/5)=1/(3/5+2/5)=1/5/5=1/1=1.

Sper ca te-am ajutat.

Answer 2

$(\frac{3}{7}*\frac{7}{5}+\frac{2}{5})^{-1}=(\frac{3*7}{7*5}+\frac{2}{5})^{-1}=(\frac{3}{5}+\frac{2}{5})^{-1}=(\frac{2+3}{5})^{-1}=(\frac{5}{5})^{-1}=1^{-1}=\frac{1}{1^1}=\frac{1}{1}=1$