在实数范围内因式分解:x方+2xy-5y方
问题描述:
在实数范围内因式分解:x方+2xy-5y方
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]