圆x^2+y^2-2x+6y+5a=0关于直线y=x+2b成轴对称图形,求a-b的范围要详解

设x、y属于r,a={(x,y)|y-2=x-3},b={(3,2),(4,3)},则a与b的关是 如果方程组x-y=a-3,2x+y=5的解x、y满足x>0,y 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 简单线性规划 在线等~!1. 已知x,y满足{x+3y-3≤0, {x≥0, 则z=(y+2)/(x-1)的取值范围是? {y≥0, 2.已知集合A={(x,y)||x|+|y|≤1},B={(x,y)|x²+y²≤1},C={(x,y)||x|≤1,|y|≤1},则A,B,C的关 1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 x*x+2x+y*y-4y+5=0 x= y= 已知关于x,y的方程组{2x+3y=2a+5 2x-3y=6a-1的解满足x>0,y {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 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(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=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 已知关于x、y 的方程组x-y=a+3与2X+Y=5的解x、y满足x>0,y x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?