(X-800)*14%=420 X=3800
(X+X)+(X-X)+(X*X)+(X/X)=100
若1+x+x*x+x*x*x=0,求x+x*x+x*x*x+.+x(2000次幂)
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)
2x+(14-x)=x+14
(x^3)^()*x^2=x^14
x(x-14)二0*x平方十|2x十27=0,x平方=x+56,x(5x+4)=5x+4,4x平方-45=3|x,-3x
已知函数f(x)=-x2-2x,g(x)=x+14x,x>0x+1,x≤0
已知x-4/x=6,求代数式2x²-20x/x²-14x+4除(1-x-12/2-x)的值
x-30%x=14x+25%x=20
f(x)=x²+3x|x-2|
0.2x+0.4x=12 x=?20x+x=420 x=?
f(x)=-x^2+2x(x>0) 0(x=0) x^2-2x(x