回複:求救:有沒有好辦法?

來源: 火球魔法 2009-10-25 16:31:37 [] [博客] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (258 bytes)
In other words, the transformation will keep (a,b,c) on the same globe surface where the center is at (0,0,0). The biggest radius for the globe is 10 * 3^(1/2) = 17.32. That means, not only 20 is not reachable, it doesn't reach anywhere bigger than 17.32.
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