<p>图示矩形截面对z1轴的惯性矩Iz1为： <img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/8e/52/8e5270dcd4907e22398bb9de1dd6dd42.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/03/96/0396eac30d9027f20394248d3d68a452.jpg" style="width: 100%;height: auto;"></p>