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看個位数字1×1,個位還是12×2,個位是43×3,個位是94×4,個位是65×5,各位是56×6,個位是67×7,個位是98×8,個位是49×9,個位是10×0,個位是0所以平方數的個位数字不可能是2,個位是,2的自然數中,共有0個平方數,故答案為:0.
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