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看個位数字 1×1,個位還是1 2×2,個位是4 3×3,個位是9 4×4,個位是6 5×5,各位是5 6×6,個位是6 7×7,個位是9 8×8,個位是4 9×9,個位是1 0×0,個位是0 所以平方數的個位数字不可能是8 個位是8的自然數中,共有0個平方數
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