x+x+x-y-y=12 y+y+y-x-x=2 求x=?y=?不能用方程用奥数解法
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
{(x,y) |x|+|y|
x>y?x:y
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
(x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少
y=x(x
x+x+x+x+y+y+y=56
X*Y,当Y
[(y*y*y-y)/(xy+1)*(xy+1)-(x+y)*(x+y)]/[(x+y)*y/(x+1)]其中x=-11,y=1/12,化简再求值.
x y x+yy x+y xx+y x y
(3x-y)(3y+x)-(x-y)(x+y)