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(2008•成都)已知y=x-1,那么x2-2xy+3y2-2的值是________.
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(2008•成都)已知y=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACWSURBVDhP3ZPLEcAgCESpjJ5sh2YshVKIiIkG
fxcnhzjDeMgGNo8NyObAQQGTIKAQv3vaiBgEAFLNBKaS8HNBhqQcrEKssE7uYrLW/Yjb2OjWpvsO
hxLVgmopmYcUFCSxpGloPEnm8tDcxLBCrdnsR9Q3M4uZIMuKWWyy34FiQoHH9Iik8+E6sBD6r3j+
qj5Nny5rsfMLN2zqeSiCl84AAAAASUVORK5CYII=
)
x-1,那么
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACWSURBVDhP3ZPLEcAgCESpjJ5sh2YshVKIiIkG
fxcnhzjDeMgGNo8NyObAQQGTIKAQv3vaiBgEAFLNBKaS8HNBhqQcrEKssE7uYrLW/Yjb2OjWpvsO
hxLVgmopmYcUFCSxpGloPEnm8tDcxLBCrdnsR9Q3M4uZIMuKWWyy34FiQoHH9Iik8+E6sBD6r3j+
qj5Nny5rsfMLN2zqeSiCl84AAAAASUVORK5CYII=
)
x
2-2xy+3y
2-2的值是________.
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