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√の中を計算すると
m²＋4×2×m²
＝m²＋8m²
＝9m²
そして、(√9＝3、√m²＝±m)
±√{m²＋4×2×m²}
＝±√{9m²}
＝±3m
なので
－m±√{m²＋4×2×m²}＝－m±3m
となっています
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