计算:已知x-2y=12,xy=2,求x²+4y²
计算:已知x-2y=12,xy=2,求x²+4y²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
计算:已知x+y=2xy,求(4x-5xy+4y)/(xy-x-y)的值【=-=速回O(∩_∩)O谢谢】
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y