Question

упростите дробь а²-9б²-а+3б / а²-9б² ​

Answer 1

$\frac{a^{2} -9b^{2}-a+3b }{a^{2} -9b^{2} } =\frac{(a-3b)(a+3b) -(a-3b)}{(a-3b)(a+3b)}=\frac{(a-3b)(a+3b-1)}{(a-3b)(a+3b)}=\frac{a+3b-1}{a+3b}$