这道题是多个乘积的复合函数的求导.设f(x)=g(x)*h(x)*k(x) 则f'(x)=g'(x)*h(x)k(x)+g(x)*[h(x)k(x)]' =g'(x)*h(x)k(x)+g(x)[h'(x)k(x)+h(x)k'(x)] = g'(x) h(x)k(x)+g(x) h'(x) k(x)+g(x)h(x) k'(x) 观察到三个乘积...