4x-4y=96,x^2-y^2=960,求x,y的值讲的清楚一点哦!
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(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-4y)(2x+y)=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=?
(x+y)^2(x-y)^2(x^4+x^2y^2+y^4)=?
y'=(y/x)^2+y/x+4微分方程
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=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
x*x+2x+y*y-4y+5=0 x= y=
如果|X|=4 |Y|=2 且|X+Y|=X+Y 求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/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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9