x=8+2y-y^2x=0,y=-1,y=3所圍

x-y/x-x+y/y-(x+y)(x-y)/y²y/x=2x-y/x-x+y/y-(x+y)(x-y)/y²y/x=2x-y/x-x+y/y-(x+y)(x-y)/y²

已知X*X+Y*Y+6X-8Y+25=0求（Y/X)+(X/Y)-2=?已知X*X+Y*Y+6X-8Y+25=0求（Y/X)+(X/Y)-2=?已知X*X+Y*Y+6X-8Y+25=0求（Y/X)+(

x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x

y"+y''-2y=2xy"+y''-2y=2xy"+y''-2y=2xy"+y''-2y=2x先求y"+y''-2y=0的通r²+r-2=0,r=1或-2y=ce^x+de^(-2x)再求一个特解,

设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于?设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于?设x大于1,y大于0,x^y+x^-y=2根号二,x^y

微分方程y"-2y''+y=x微分方程y"-2y''+y=x微分方程y"-2y''+y=x先求对应齐次方程的特征方程为r″-2r+1=0r1=r2=1齐次方程的通解为Y=e^x(C1+C2x)再求非其次方程

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=【2(x-y)^3-8(

（x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.（x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.（x-y)(x+y)-(x+y)^2+2y(y-x)

2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=22y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=22y(x+二分之一y)-[(x+

{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+

12y(x-y)^2-8(x-y)^3=?12y(x-y)^2-8(x-y)^3=?12y(x-y)^2-8(x-y)^3=?12y(x-y)²-8(x-y)³=4(x-y)

(X,Y)f(x,y)={12y^2,0(X,Y)f(x,y)={12y^2,0(X,Y)f(x,y)={12y^2,0同学,我能写的就是这么多了.

已知x^2+y^2-8x+12y+52=0,求1/2x-1/x-y(x-y/2x-x^2+y^2)已知x^2+y^2-8x+12y+52=0,求1/2x-1/x-y(x-y/2x-x^2+y^2)已知

已知x^2+y^2-8x+12y+52=0,求1/2x-1/x-y(x-y/2x-x^2+y^2)已知x^2+y^2-8x+12y+52=0,求1/2x-1/x-y(x-y/2x-x^2+y^2)已知

已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值已知(3x+1)(3x-3)-3x+2)^2=-

x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1y=?x=?x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y

设x>0,y>0,x+y=1,求8/x+2/y的最小值设x>0,y>0,x+y=1,求8/x+2/y的最小值设x>0,y>0,x+y=1,求8/x+2/y的最小值因x+y=1,===>(8/x)+(2

x>0,y>0,x+y=1,求8/x+2/y的最小值?x>0,y>0,x+y=1,求8/x+2/y的最小值?x>0,y>0,x+y=1,求8/x+2/y的最小值?这是很典型的一道均值不等式题,关键是乘

x^+2x+1+y^2-8y+16=0求y/xx^+2x+1+y^2-8y+16=0求y/xx^+2x+1+y^2-8y+16=0求y/x∵x^2+2x+1+y^2-8y+16=(x+1)^2+(y-

对于(y一撇）y`=y/x(y-1)求导,我求的结果是y``=-y^2-y`x+y/x^2(y-1)^2怎么不对啊,我的求导过程是：y`x(y-1)-[x(y-1)]`yy`xy-y`x-(y-1+x