Question

Сократите дробь.
а) a^4 - ab^2/a^2
b) 3b - b^2/9 - b^2

Answer 1

Смотри...................

Answer 2

спасибо

Answer 3

$frac{ {a}^{4} - {ab}^{2} }{ {a}^{2} } = frac{a times ( {a}^{3} - b {}^{2} )}{ {a}^{2} } = frac{ {a}^{3} - {b}^{2} }{a} \ \ frac{3b - b {}^{2} }{9 - b} = frac{b times (3 - b)}{(3 - b) times (3 + b) } = frac{b}{3 + b}$