若X2-4X2=0(x>0,y>0),求(5x+4y)/(3x-2y)
若x2+y2+4x-2y+5=0,求x,(注x2,按ALT+178)
已知:x2+4x+y2-6y+13=0,求(x-2y)/(x²+y²)
化简求值:(-3x2-4y)-(2x2-5y+6)+(x2-5y-1),其中x、y满足|x-y+1|+(x-5)2=0.
化简求值:已知x、y满足:x2+y2-4x+6y+13=0,求代数式(3x+y)2-3(3x-y)(x+y)-(x-3y
求函数值域:y=(2x2+4x-7)/(x2+2x+3)
已知x2+4x+y2-2y+5=0,求x,y的值.
已知x2+y2-6x+4y+13=0,求2x+3y
若实数x,y满足(x+2y-2)(3x+2y+2)+2(x2+4)=0,求x+y的值.
已知x2+y2+4x-6y+13=0 求x2-2x\x2+3y2
已知x2+y2-2x+4y+5=0,求(x^4-y^4)/(2x^2+xy-y^2)·[(2x-y)/(xy-y^2)]
若X2+Y+2x-4根号y+5=0,求根号xy
已知x2-4x-1=0,求代数式(2x-3)2-(x+y)(x-y)-y2的值