x^3+y^3=x-y求证x^2+4y^2〈1不好意思,我掉了个条件,x>0,y>0
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![x^3+y^3=x-y求证x^2+4y^2〈1不好意思,我掉了个条件,x>0,y>0](/uploads/image/z/10038110-14-0.jpg?t=x%5E3%2By%5E3%3Dx-y%E6%B1%82%E8%AF%81x%5E2%2B4y%5E2%E3%80%881%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D%EF%BC%8C%E6%88%91%E6%8E%89%E4%BA%86%E4%B8%AA%E6%9D%A1%E4%BB%B6%EF%BC%8Cx%3E0%2Cy%3E0)
x^3+y^3=x-y求证x^2+4y^2〈1不好意思,我掉了个条件,x>0,y>0
x^3+y^3=x-y求证x^2+4y^2〈1
不好意思,我掉了个条件,x>0,y>0
x^3+y^3=x-y求证x^2+4y^2〈1不好意思,我掉了个条件,x>0,y>0
马甲..
设正实数x,y满足x^3+y^3=x-y,求证:x^2+4y^2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
设x>0y>0,x≠y,x^2-y^2=x^3-y^3,求证:1<x+y<4/3
x大于0,y大于0,x不等于y,且x+y=(x^2)+(y^2)+xy,求证1小于x+y小于4/3
已知,x>0,y>0,x≠y,且x+y=x^2+y^2+xy,求证:1小于x+y小于4/3
已知x,y都是正整数,求证x^3+y^3>=x^2y+xy^2
若X,Y是整数,求证:(x+y)(x+2y)(x+3y)(x+4y)+y的四次方是一个完全平方数急 THANKS!
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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
{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
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