Question

раскройте скобки (х/3-0,5у)^2

Answer 1

х^2/9 - х*у/3 + 0,25*у^2

Answer 2

$(a-b)^2=a^2-2ab+b^2\\(frac{x}{3}-0,5y)^2=(frac{x}{3})^2-2cdot frac{x}{3}cdot 0,5y+(0,5y)^2=\\=frac{x^2}{9}-frac{xy}{3}+frac{y^2}{4}$