想好了嗎?
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答案:答案是18.
11 × 11 = 121 → 1 + 2 + 1 = 4
22 × 22 = 484 → 4 + 8 + 4 = 16
因此推論出,
33 × 33 = 1089 → 1 + 0 + 8 + 9 = 18
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