若2X^2－6X+Y^2=0,求X^2－2AX+Y^2的最小值解：由2x^2-6x+y^2=0,得y^2=-2x^2+6x ≥0得出0≤x≤3,所以问题转化为求x^2-2ax+y^2=-x^2+2(3-a)x (0≤x≤3)的最小值；1.当a-3≤3/2,即a≤9/2时,（x^2-2ax+y^2)min=(-x^2+2(3-a)x)min=9-6

(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=－2 0 求x,y分可以加. x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 求y=(x^2)+2x(x≥0) y=-x+2x(x 若x+y－4x－2y＝0,求x+y最大值 若｜x｜=3,｜y｜=2,且｜x－y｜=y－x,求x+y的值. 若x^2+y^2-6x+4y+13=0 求x+y 因式分解 若 x^2+4x+y^2-6y+13=0 求y^x 若x²+2x+y²-6y+10=0求x y 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x^2+y^2-10x-6y+34=0,求（x-y)/(x+y)的值 Y=X^2X (X>0) 求导Y=X^2X (X>0) 求d(Y)/d(X) 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若X^2+y^2+2x-6y+10=0,求y^2x-x^2011的值 若x*x+y*y=x+y-1/2,求x,y的值如题 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 若(x+y)(x+y-1)-2=0,求x+y的值求 已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2