Question

помогите решить пример!

Answer 1

$cfrac{0.2^2-2*0.06+0.3^2}{0.5*0.9-0.5}= cfrac{(0.2-0.3)^2}{0.5*(0.9-1)}= cfrac{(-0.1)^2}{0.5*(-0.1)} = cfrac{-0.1}{0.5} =-0.2$