Question

Как сократить дробь
81a^2-b^2:
(9a-b)^2

Answer 1

$frac{81a^2-b^2}{(9a-b)^2} = frac{(9a-b)(9a+b)}{(9a-b)(9a-b)} = frac{9a+b}{9a-b}$

Answer 2

$frac{81a ^{2} -b ^{2} }{(9a-b)^{2} } = frac{(9a-b)(9a+b)}{(9a-b)(9a-b)} = frac{9a+b}{9a-b}$