圆C：x^2+y^2+2x+4y+1=0,直线l过圆心C且与原点距离最大,求直线方程要详细点的 在线等

如果A={（x,y）|x,y+2>0},B={（x,y）|2x+3y-6>0},C={（x,y）|x-4 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 圆x²+y²-x+2y=0关于直线x-y+1=0对称的圆的方程是A、x²+y²+4x-3y+5=0B、x²+y²+4x+3y+5=0C、x²+y²-4x-3y+5=0D、x²+y²+4x+3y-5=0 x*x+2x+y*y-4y+5=0 x= y= {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 1、(x+y)-(x+y)^32、x(x-y)-y(y-x)3、(a-b)^2-4b+4a4、a^n+1+a^n+a^n-15、x(x+y)(x-y)-x(x+y)^26、已知a+c-7=0,求(a+b)^2-2a(b-c)-2b(b-c)+(c-b)^2的值7、x^2-8y^2(x^2-2y^2) {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 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 解微分方程y`=1/(x-y)+1答案(x-y)^2+2x=c C语言中printf((%d%d,x,y,(x,y))x=1,y=2 1.已知集合A={(x,y)|x^2-y^2-y=4},B={(x,y)|x^2-xy-2y^2=0},C={(x,y)|x-2y=0}D={(x,y)|x+y=0}1)判断B、C、D间的关系；2)求A交B. 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? 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 已知圆C:x^2+y^2-2x-2y+1=0,直线l:y=kx