x^2+y^2=6x-4y-9,则2x-3y的最小值和最大值的和,把最大值和最小值是什么写明白
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x,y为实数,根号3x+4 +y^2-6Y+9=0则x+y=?
(x+y)^2+6(x+y)+9