在实数范围内因式分解：x方+2xy-5y方

1个回答

x方+2xy-5y方
=(x²＋2xy＋y²)－6y²
=(x＋y)²－(√6y)²
=(x＋y＋√6y)(x＋y－√6y)
=[x＋(1＋√6)y][x＋(1－√6)y]