若x²-4x+y²+2y+5=0,求x,y的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x² +y²+5/4=2x+y,求y-x的值
1.若x²+y²-4x+2y+5=0,求x,y的值.
若x²-4x+y²+2y+5=0,求x、y的值.
若X-2Y+6+(X+Y+12)²=0,求4X+ 5Y的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
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X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.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?
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知:x²+2x+y²-4y+5=0,求y的x次幂的值
若x²-4x+y²+6y+13=0,求2x-y的值