<p>已知25与实数<img src="https://file.gaojiufeng.cn/learnAppQuestion/2e/20/2e20da39ab25189a886a602e16ed7825.jpg" style="width: 100%;height: auto;">的等比中项是1，则<img src="https://file.gaojiufeng.cn/learnAppQuestion/e5/36/e53652d695d12098f3825a59021a022b.jpg" style="width: 100%;height: auto;">（）.</p>