x+5y+2=0,则4^2x+y*8^y-x
已知x*x+4x+y*y-2y+5=0,则x*x+y*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x²+4x+y²-2y+5=0,则x+y=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y
y满足x^2+y^2-4x-2y+5=0求根号下8y-2x分之根号下x+y(不包括+y)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27