(5/2)x+(2/3)y=-10x/3-y/9=1(x-y)/5-(x+y)/2=-1/10(x-y)/7-(x+y)/6=1/2

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(5/2)x+(2/3)y=-10x/3-y/9=1(x-y)/5-(x+y)/2=-1/10(x-y)/7-(x+y)/6=1/2
(5/2)x+(2/3)y=-10
x/3-y/9=1
(x-y)/5-(x+y)/2=-1/10
(x-y)/7-(x+y)/6=1/2

(5/2)x+(2/3)y=-10x/3-y/9=1(x-y)/5-(x+y)/2=-1/10(x-y)/7-(x+y)/6=1/2
(5/2)x+(2/3)y=-10 --(1)
x/3-y/9=1 --(2)
由（2）得x=3+1/3y 代人（1）
有2/5(3+1/3y)+2/3y=-10
y=-35/3
代入x=3+1/3y x=-8/9
所以x=-8/9
y=-35/3
第二题上面有答案,思路可以把x+y、x-y看分别看做一个整体

X=-9/8,Y=-35/3
X=-37,Y=16

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 (x+5y)^+(2x+10y)(3x-y)+(3x-y)^ (x+5y)²-(2x+10y)(3x-y)+(3x-y)² 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 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 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、（x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3 5(x+y)-2x=0 3x-10(x+y)=2 {2X=5(X+Y) 3X-10(X+Y)=2 {2X=5(X+Y)3X-10(X+Y)=2怎么解?