186° Вправа 186Алгебра 8 клас Тарасенкова 2025 · § 5 · стор. 57

186. Знайдіть добуток дробів:

1) ${\displaystyle \frac{y+3}{4}\cdot \frac{20}{{(y+3)}^2}=}$${\displaystyle \frac{\cancel{\left(y+3\right)}\cdot 5\cdot \stackrel{1}{\cancel{4}}}{\underset{1}{\cancel{4}}\cancel{\left(y+3\right)}(y+3)}=}$${\displaystyle \frac{5}{y+3}}$;

2) ${\displaystyle \frac{3x+2}{15}\cdot \frac{25}{6+9x}=}$${\displaystyle \frac{\cancel{\left(3x+2\right)}\cdot 5\cdot \stackrel{1}{\cancel{5}}}{3\cdot \underset{3}{\cancel{15}}\cancel{\left(3x+2\right)}}=}$${\displaystyle \frac{5}{9}}$.