x+y=12;35x+(35/2)y=350
Y-X=45 (85%Y-X)×8=(Y-35-X)×12
Y-X=45 (80%Y-X)×8=(Y-35-X)×12
y-x=458(0.85y-x)=12(y-35-x)
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
y'-2y=(e^x)-x
y'+2y/x=x通解
(x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值