设圆C:X^2+Y^2-2X-4Y-6=0,过A(0,3)坐直线L交C于P、Q两点,若OP⊥OQ（O为坐标轴原点）求L方程最好附个图1L误把OP和OQ当半径了- 圆心是C啊喂,O是坐标轴原点附个图有加分

设A={(x,y)}|3x+2y|.设A={(x,y)}|3x+2y|.B={(x,y)|x-y=2|},C={(x,y)|2x-2y|=3},D={(x,y)|6x+4y=2|},求A∩B,B∩C,A∩D设A={(x,y)|3x+2y=1}.B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D={(x,y)|6x+4y=2},求A∩B，B∩C，A∩D 设z={x-y x≥2y,x/4+y/2 x 设圆C:x^2+y^2+4x-6y=0,若圆C关于直线l:a*(x-2y)-(2-a)*(2x+3y-4)=0对称,求实数a的值 设圆C:x^2+y^2+4x-6y=0,若圆C关于直线l:a*(x-2y)-(2-a)*(2x+3y-4)=0对称,求实数a 设十位为x,个位数字为 y,列方程组 x+y=6,10x+y+18=10y+x x=2,y=4 设f(x+y,x-y)=x^2-y^2,则f(x,y)= 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 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设集合A={x|x=y^2-2y-8},B={x|y=-x^2+2x+3},C={y|y+1 设不等式组x+y-2>=0,x-3y+6>=0,x-y 设z=2x+y式中变量x,y同时满足x-4y 设2x+y=6,2x-y=4,则4x²-y²= A 12 B 24 C 10 D 无法计算 设A={(x,y)|3x+2y=1},B={(x,y)|x-y=2},C={(x,y)|2x-2y=3},D=((x,y)|6x+4y=2),求A∩B,B∩C,A∩D. 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设实数x,y 满足x²+4y²+2x-4y+2+0 则x+y= 设X,Y满足条件x-y+2>=0,x+y-4>=0,2x-y-5 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2