Question

Ajutor va rog :Calculați (7/5+3/5)²-(7/5)²-(3/5)²

Answer 1

$( \frac{7}{5} + \frac{3}{5}) ^{2} -( \frac{7}{5} )^{2} -( \frac{3}{5} )^2=( \frac{7}{5} )^2+2* \frac{7}{5} * \frac{3}{5} + (\frac{3}{5} )^2-( \frac{7}{5} )^{2} -( \frac{3}{5} )^2= 42/25$