![[從零到奧數] #30. xy=a; xz=b; yz=c; x^2+y^2+z^2=?](https://1a-1791.com/video/s8/1/0/Y/F/a/0YFaf.qR4e-small--30.-xya-xzb-yzc-x2-y2-z2.jpg)
[從零到奧數] #30. xy=a; xz=b; yz=c; x^2+y^2+z^2=?
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