1,(-x+y=37) 2,( 2x=5y) 解2元一次方程组1,(-x+y=37)2,( 2x=5y)
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分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
若(5x+y)/(7x+10y)=1/2则x/y=
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
y=2x*(*代表X)y=(lnx)*y=(x/1+X)*
先化简再求值(x-y)(x-2y)-1/2(2x-3y)(x+2y),其中x=2,y=2/5
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
(5x-y)(y+5x)-(3y+2x)(3y-2x) x=1 y=2先化简再求值
先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2
2x-y-(2y平方-x平方)-5x+y+(x平方+2y平方),x=-1,y=1