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この式の因数分解の仕方を教えてください🙇

(8) a²-4a+4-b²
因数分解

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✨ Best Answer ✨

a^2-4a+4=(a-2)^2
(a-2)^2-b^2で2乗-2乗なので、
(a+b-2)(a-b-2)

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