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216 = 2*108 = 4*54 = 8*27 以上等式中只有8*27滿足a b是自然數 8 = 2^3 27 = 3^3 所以a = b = 3 a^2 * b^3 = 3^2 * 3^3 = 9 * 27 = 243
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