Mathematics
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赤→青へはどのように式変形しているのか教えてください🙇‍♀️

n (2) (4k3-1)=4k³-1 1)=42 k³ - 21 k=1 k=1 k=1 2 = = 4√ - n &= n{n(n2+2n+1)-1) = n(n³+2n2+ n − 1) -

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✨ Best Answer ✨

4と1/2の二乗で相殺したあと、nで括っています

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