|x+y-5|+根号xy-3=0 (1)求x²+y² (2)求x²-y²
已知x=根号3+根号2,y=根号3-根号2,求(x²+xy+y²)/(x+y)-(x+y)
|x+y-5|+根号xy-3=0 (1)求x²+y² (2)求x²-y²
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
若实数x,y满足x根号(1-x)=根号(y-2)+根号(x-1),求3x²+xy-y²/x²
已知(4x-2y-1)²+根号(xy-2)=0,求4x³y-4x²y²+xy
已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
已知x平方+y平方-2y+1=0,求(根号x+根号y+3)/((根号xy+y)(3根号x+根号y))
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知x=根号5-2分之根号5-2,y=根号5+2分之根号5-2.求(1)x+y (2)xy (3)x+y分之x²
已知x-y=根号5,xy=二分之一,求x²-xy+y²
|x+2|+(y-1/4)²=0,求2(x²y+xy)-3(x²y-xy)-4x²