3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y)
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3(x-y)+5(x-y)=194(x+y)-2(x-y)=-1解方程组是3（x+y)3(x-y)+5(x-y)=194(x+y)-2(x-y)=-1解方程组是3（x+y)3(x-y)+5(x-y)=
3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y)
3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1
解方程组
是3（x+y)
3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y)
题目有误,请改正
3(x+y)+5(x-y)=19 ,①
4(x+y)-2(x-y)=-1.②
①*2+②*5,26(x+y)=33,
x+y=33/26,③
①*4-②*3,26(x-y)=79,
x-y=79/26,④
[③+④]/2,x=28/13,
[③-④]/2,y=-23/26.
本题有多种解法.
（5x+3y)(3y-5x)-(4x-y)(4y+x)=
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
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（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
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x-4y(y-x)=?
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)
3x-y+x=3 4【X-y-1】=3【1-y】-1 5x-4y+4x=3 2x+y-3x=11 【 x除以2 】-【y 除以3】 =2 2x+7y-3x=19 x+y+x=12 3x+2y-x=18
3X=5Y （X+Y)*3X=(2Y+X)*4+2*2
3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 ｛3分之2（x-y）=4分之x+y-1 6）x+y)=4(2x-y)+16
y=|-x.x+4x+5|