如何解y=x＋6,x^2+y^2-2y-4=0的联立方程,

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x>0,Y>0,如何证x^2/y+y^2/x>=x+y 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 如何解xy(x-y)-x(x-y)^2 如何解y=x＋6,x^2+y^2-2y-4=0的联立方程, 此微分方程如何解?y'y=y'+y+2x^3+2x^2-1 求y=? 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 微分方程的一道题 y''(x+y'^2)=y'y''(x+y'^2)=y' 请问这道题如何计算, 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1 y+y'-2y=2x 如何画出图像y=x/x^2+x-6 微分方程y - 2y' + y = x 带分数的二元一次方程如何解x+y/3+x-y/2=6 3(x+y)-2(x-y)=28 设这间屋子有x张桌子,有y个人.3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 如何解 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 [(2x-y)(2x+y)+y(y-6x)]÷2x=?