215,124,63,()

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215,124,63,()
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215,124,63,()
215,124,63,()

215,124,63,()
26
215=6^3-1
124=5^3-1
63=4^3-1
26=3^3-1

26
6^3-1,5^3-1,4^3-1,3^3-1
所以26

26
215 = 6^3 - 1 = 6 * 6 * 6 - 1
124 = 5^3 - 1 = 5 * 5 * 5 - 1
63 = 4^3 - 1 = 4 * 4 * 4 -1
所以 应填 3 ^3 - 1 = 26