(1)2x-3y=5 3x+2y=1 (2)x+2y=3 x-3y+z=0 2x+y-z=5
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(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;
已知2x-y=0,求分式【1+(3*y*y*y/x*x*x-y*y*y)】/【1+(2y/x-y)】的值注:x*x*x-y*y*y=(x-y)*(x*x+xy+y*y)
(5x-y)(y+5x)-(3y+2x)(3y-2x) x=1 y=2先化简再求值