0.3(y-2)+1=x+2/5 y-3/20-x+3/5=1 解一下这个二元一次方程组!
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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
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
化简求值(x+2y)^2-(2x+y)(2x-y)-5y(y-x) 其中 x=1/3 y= -1/2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
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
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51