x²+y²-4x+y+17/4=0 ,求(x+y)的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x-y=4,x²-y²=20,求x-y的值
已知x² +y²+5/4=2x+y,求y-x的值
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
x²+4y²-2x+12y+10=0求X,Y值
求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0
已知实数X、Y满足X²+4y²+2x-4y+2=0 求X的2y次方+2x的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
如果2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y的值