x²+3xy+2y²=0
(x+y)(x+2y)=0
x=-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
x2+3xy+2y2=0,则x2+y2/xy
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