x2+3xy+2y2=0,则x2+y2/xy

分类: 作业答案 • 2023-01-23 14:16:24

问题描述：

答

x²+3xy+2y²=0(x+y)(x+2y)=0x=-y或x=-2y(x²+y²)/xy=2y²/-y²=-2或(x²+y²)/xy=5y²/(-2y²)=-5/2(x²+y²)/xy的值为-2或-5/2