Mathematics
Senior High
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10(x2乗+5x)から(x2乗+5x+10)になる理由がわかりません 教えてください!!

②) (与式)=[(*二1(x二4④]x【(z十2*十3]一24 =((z2上5 エ41(z2す5*)十6]一24 (2上5y7十10(x二5) =(z2十5)(y?十5x十10) =タテァ十5)(x2十5*十10) ァ2上5x王4 とおいてから展開してもよい。

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