Question

ПОМОГИТЕ ПЛИЗЗ!!!!!!!!!!

Answer 1

$1)(3-frac{1}{5}a)(3+frac{1}{5}a)=3^{2}-(frac{1}{5}a)^{2}=9-frac{1}{25}a^{2}=9-0,04a^{2}\\2)(5b^{2}+1)(1-5b^{2})=1^{2}-(5b^{2})^{2}=1-25b^{4}$

Answer 2

можете еще это https://znanija.com/task/31552090

Answer 3

https://znanija.com/task/31552090