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104永春高中一題

回復 1# leo790124 的帖子

n2 時,

12n12n2n12=2n12n122n122n12n=2n12n1222n12n+1+1=2n12n122n12n22+10

2n2n1212n1

故,

對任意自然數 n,恆有 Tn2212+21+122+123+=2+21121=3

多喝水。

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