(x-3)²=9-x²(x-3)²- ( x²- 9 ) = 0 (x-3)²- ( x+3 )(x-3) = 0 (x-3) (x-3-x-3) = 0 (x-3 ) x (-6) = 0 x =3 施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习,将来...