・この動画「

第九讲代数式求值课后小练习

」@bilibili.comと
　　↓↓↓一緒に視聴されています(Often Viewed With)：↓↓↓
・第七讲认识代数式课后小练习
・第三讲课后小练习
・平面上的任何三个圆，它们的外切线总是在共线点相交。
・第八讲整式的加减课后小练习
・现在的数学都这么超前了吗

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