若x^2-3xy-4y^2=0,则x/y=(我要步骤)
若x^2-3xy-4y^2=0,则x/y=(我要步骤)
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知x-y=4xy,则2x+3xy-2yx-2xy-y
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
3x的平方y-[2xy的平方-2(xy-3/2x的平方y)+xy}+3xy的平方 其中x=3 y=-1/2要步骤
3x的平方y-[2xy的平方-2(xy-3/2x的平方y)+xy]+3xy的平方 其中x=8 y=-1/2要步骤
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*
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值