y=x(16-3x) (0
y=x(16-3x) (0
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
设x,y满足约束条件x>=0 y>=x 4x+3y
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3