{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
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{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-13
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
3(x+y)+3(y-x)=1 (1)
3(x+y)+4(y-x)=-1 (2)
(2)-(1) 得
y-x=-2 (3) 代入 （1）
3（x+y)-6=1
x+y=7/3 => x=7/3－y
又由（3）得x=y+2
y+2=7/3－y
2y=7/3-2=1/3
y=1/6
x=13/6
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
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(3x-y)(3y+x)-(x-y)(x+y)
y'=(x-y+1)/(x+y-3)通解
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
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