定积分是一个常数,导数为0,你问的应该是变限积分函数吧设变限积分函数F(x) = ∫[a(x),b(x)] f(t) dt则dF(x)/dx = d[ ∫[a(x),b(x)] f(t) dt ]/dx = f[b(x)] * d[b(x)]/dx - f[a(x)] * d[a(x)]/dx此处最好不要写成F'(...