Question

Надо срочно! Помогите плез

Answer 1

$1); ; frac{y}{x}=4\\frac{10y^2-3xy+20x^2}{8x^2+xy+y^2}=Big [frac{:x^2}{:x^2}Big ]=frac{10(frac{y}{x})^2-3cdot frac{y}{x}+20}{8+frac{y}{x}+(frac{y}{x})^2}=frac{10cdot 4^2-3cdot 4+20}{8+4+4^2}=frac{168}{28}=6\\2); ; frac{a}{b}=3\\frac{6b^2+10ab+a^2}{a^2-ab+3b^2}=Big [frac{:b^2}{:b^2}Big ]=frac{6+10cdot frac{a}{b}+(frac{a}{b})^2}{(frac{a}{b})^2-frac{a}{b}+3}=frac{6+10cdot 3+3^2}{3^2-3+3}=frac{45}{9}=5$