圆(x-2)^2+(y-1)^2=20/3与X^2/2b^2+Y^2/b^2=1(b>0)相交于AB两点且AB为圆的直径,求椭圆方程圆(x-2)^2+(y-1)^2=20/3与X^2/2b^2+Y^2/b^2=1相交于AB两点且AB为圆的直径1 求椭圆方程2 设L为过椭圆右焦点F的直线,交椭圆于

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2 （x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3. 1=x+y 2=20x+30y 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 集合N=｛（x,y)|（x-1）^2｝+(y-1)^20},M={(x,y)|x^2+y^2 圆x^2+y^2=1,求点[(x(x+y),y(x+y)]的轨迹方程 1/(x+y)-1/(x-y)=-3/20,2/(x+y)+3/(y-x)=-(1/5)急啊! x+2y=2x+y+1=7x-y 求：2x-y? x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 二元一次方程 ：2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 设x,y满足约束条件x+y>=1,x-y>=-1,2x-y 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51