x²+y²-6x+8y+25=0求(x-y)-²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
x²+y²-6x+8y+25=0求(x-y)-²
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
实数x,y满足x²+y²+8x+6y+25=0,求x²+4xy+4y²分之x
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+y²-6x+8y+25=0,求x、y的值
已知x²-6x+8y+y²+25=0,求2x-3y的值
已知:x²-6x+8y+y²+25=0 求、2x+3y的值,
2x²+3y²-8x+6y+11=0,求x+y=( )
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
2x²-3xy=y²=0(x,y不得o)求x/y+y/x