求两圆X^2+Y^2-X+Y-2=0和X^2+Y^2=5的公共弦长

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x+2y+2=0 7x-4y=-41 求x和y 解方程组,(x+y)^2-3(x+y)=0和x-y=1 x+y=0 x-y=2 x和y分别等于几? 2x=5y,(x,y不等于0)x和y成什么比例 根号X+Y-8+根号X-Y+2=0求X 和 Y 方程x(x*x+y*y-1)=0和x*x-(x*x+y*y-1)^2=0表示的图形是? matlab y=[ ]; x=0:0.1:2; y=[y,cos(x)]; plot(x,y) 其中y=[ ]和y=[y,cos(x)]; 啥意 {x+2y+2=0 {7y-4y=-41 求X和Y 已知x>0,Y>0,如何证x^2/y+y^2/x>=x+y x*x+2x+y*y-4y+5=0 x= y= 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 化简y(x+y)+(x+y)(x-y)-x^2 因式分解x(x+y)(x-y)-x(x+y)^2 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 变量x,y满足x-2y=0,x 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*y)的值 (X,Y) f(x,y)={12y^2,0