<p>放大电路如题25图所示，已知<img max-width="300" src="https://learnfile.20230611.cn/learnAppQuestion/91/4b/914b493483ff6f1a4a8c03040f8030e6.jpg" style="width: 100%;height: auto;"><img max-width="300" src="https://learnfile.20230611.cn/learnAppQuestion/0d/1d/0d1