f'(x)=(x-1)‘x(x-2)(x-3)(x-4).(x-100)+(x-1)[x(x-2)(x-3)(x-4).(x-100)]'f'(1)=-99!f'(x)=(x-100)'x(x-1)(x-2)(x-3)(x-4).(x-99)+(x-100)[x(x-1)(x-2)(x-3)(x-4).(x-99)]'f'(100)=100!(uv)'=u'v+uv’乘法求导公式...谢谢，但第二题应该是99！吧？（-1）^99=-1