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x=5の場合、(x-5)の0乗の無意味な定義:任意の2つの不ゼロの数の0乗は1に等しい(x-5)このように(x-5)^0=(x-5)^n/(x-5)^n=(x-5)^(n-n)=(x-5)だから、(x-5)の0乗が無意味であれば、...
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