<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/09/e8/09e840b5615c3d6ace4f60bae9ff5785.jpg" style="width: 100%;height: auto;">则Q'(x)等于： <img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/39/23/39234edcee23f6881eb90d0caa97e65c.jpg" style="width: 100%;height: auto;">