若4x^2-4x+9y^2-12y+5=0,求(x-3y)^2-(x+3y)^2
若2x-3y=0,求5x+4y/3x-2y
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
若4x^2-4x+9y^2-12y+5=0求6x+2/3y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27