Question

сократите дробь y^2-81/9y+y^2 если y=0.3

Answer 1

$\frac{y^2-81}{9y+y^2} = \frac{(y-9)(y+9)}{y(y+9)} = \frac{y-9}{y}$
Если $y=0.3$, то $\frac{0.3-9}{0.3} = \frac{-8.7}{0.3} =-29$