圆C:x^2+y^2-10x+4y-5=0上任意一点关于直线ax-y-5a=2的对称点的位置A在圆C上B在圆C内C在圆C外D与a的取值有关

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解 x*x+2x+y*y-4y+5=0 x= y= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 x+5y=4,2x+10y=? 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 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 4[2x+y]-5[2x-y]=32[2x+y]+10[2x-y]=39 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值 圆C:x^2+y^2-2x+4y-15=0 上有一点(x,y) 求2x+y的最大值和最小值圆C:x^2+y^2-2x+4y-15=0上有一点(x,y)求2x+y的最大值和最小值答案是10,-10 感恩