先证明奇函数的导数是偶函数,偶函数的导数是奇函数：f(x)偶时f'(-x) = lim(f(-x+h)-f(-x))/h [h→0] =lim(f(x-h)-f(x))/h [h→0] = -lim(f(x)-f(x-h))/h [h→0]=- f'(x)f(x)奇时f'(-x) = lim(f(-x+h)-f(-x))/h [h...