y\"+2y\'+y=xx

(x-y)(x+y)(xx-yy)=?(x-y)(x+y)(xx-yy)=?(x-y)(x+y)(xx-yy)=?(x-y)(x+y)(xx-yy)=(x^2-y^2)(x^2-y^2)=x^4-2x

[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5[(x-y)²+（x+y）(x-y)]/2

2x+y=10怎么解求Xx+2y=8求Y2x+y=10怎么解求Xx+2y=8求Y2x+y=10怎么解求Xx+2y=8求Y两个未知数少一个方程,解不出来X.有无数解x于y的值相等y=x代入2x+y=10

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

xx+12*12=yy(y-x=2)xx+12*12=yy(y-x=2)xx+12*12=yy(y-x=2)xx是x^2(x的平方)的意思吗?==>xx+12*12=yy==>x^2-y^2=-144

[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)[2x-(x+y)(x-y)](yy-xx)=(2x-xx+yy)(

xyx+yyx+yxx+yxyxyx+yyx+yxx+yxyxyx+yyx+yxx+yxy把所有列都加至第一列,第一列都是2x+2y将2x+2y提出,第一列剩下都是1,此时式外边有一因子（2x+2y）

xyx+yyx+yxx+yxyxyx+yyx+yxx+yxyxyx+yyx+yxx+yxyc1+c2+c3第2,3列加到第1列2(x+y)yx+y2(x+y)x+yx2(x+y)xyr2-r1,r3-

xx+2x+yy+6y+10=0求xx+yy的值xx+2x+yy+6y+10=0求xx+yy的值xx+2x+yy+6y+10=0求xx+yy的值∵x²+2x+y²+6y+10=0∴

若xx-2x+yy+6y+10=0求xx-yyy的值若xx-2x+yy+6y+10=0求xx-yyy的值若xx-2x+yy+6y+10=0求xx-yyy的值xx-2x+yy+6y+10=0则xx-2x

若xx-2x+yy+6y+10=0求xx-yyy的值若xx-2x+yy+6y+10=0求xx-yyy的值若xx-2x+yy+6y+10=0求xx-yyy的值xx-2x+yy+6y+10=0即(xx-2

已知x(x-1)-(xx-y)=-3求xx+yy-2xy已知x(x-1)-(xx-y)=-3求xx+yy-2xy已知x(x-1)-(xx-y)=-3求xx+yy-2xy已知x(x-1)-(x²

已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值x

x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值x(x+

已知2x=3y,求xy/xx+yy-yy/xx-yy的值已知2x=3y,求xy/xx+yy-yy/xx-yy的值已知2x=3y,求xy/xx+yy-yy/xx-yy的值2/91/9

已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值.已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值.已知xx+yy+4x-6y+13=0,求（xx-2x

已知xx+y=5,xy=-3,则x^2y+xy^2=已知xx+y=5,xy=-3,则x^2y+xy^2=已知xx+y=5,xy=-3,则x^2y+xy^2=x+y=5,xy=-3,则x^2y+xy^2

x-y/x+y=2,则xx+2xy+yy/4xy=?x-y/x+y=2,则xx+2xy+yy/4xy=?x-y/x+y=2,则xx+2xy+yy/4xy=?因为x-y/x+y=2所以（x-y)=2x+

已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:ZX

x+2z=3y判断xx-9y+4zz+4xz是否是定值x+2z=3y判断xx-9y+4zz+4xz是否是定值x+2z=3y判断xx-9y+4zz+4xz是否是定值是不是x2-9y2+4z2+4xz?x