把3Y^2-2y-2=0
根据韦达定理,得X1+X2=2/3,X1*X2=-2/3
（X1+X2)^2-4X1*X2=(X1-X2)^2=28/9
或者直接求他的根：X1=（1+√7）/3,X2=（1-√7）/3
得(X1-X2)^2=28/9
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