Question

сократить дроби,,,,,,,,,

Answer 1

$\frac{y ^{2}+y }{y ^{2} } = \frac{y(y+1)}{y ^{2} } = \frac{y+1}{y} \\ \\ \frac{a ^{2} -2a}{a ^{2}-4 } = \frac{a(a-2)}{(a-2)(a+2)} = \frac{a}{a+2}$