1.已知函数f(x)= x2+x+4x(x>0)x2-x+4-x(x<0) ,(Ⅰ)求证:函数f(x)是偶
1.已知函数f(x)= x2+x+4x(x>0)x2-x+4-x(x<0) ,(Ⅰ)求证:函数f(x)是偶函数;
1.已知函数f(x)=
x^2+x+4x(x>0)x^2-x+4-x(x<0)
(3)1≤|x1|≤4,1≤|x2|≤4求|f(x1)-f(x2)|≤1
1.已知函数f(x)=
(x^2+x+4)/x(x>0) -(x^2-x+4)/x(x<0)
(3)1≤|x1|≤4,1≤|x2|≤4求|f(x1)-f(x2)|≤1