已知y+y'*x²=0,求y=?
已知y+y'*x²=0,求y=?
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x²+y²-2x+4y+5=0,求x+y
已知x²+4x+y-2y+5=0求x+2y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知:4x = 5y,求(x+y) :y