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x²+5x=Aとおくと、
(x²+5x)²+10(x²+5x)=A²+10A
=A(A+10)
Aをx²+5xにもどし、
(x²+5x)(x²+5x+10)
となります
まとめるの大事なんですね!素敵な回答ありがとうございます🙇🏻♀️🙏🏻
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めっちゃ分かりやすすぎました😭💓
ありがとうございます🙇🏻♀️🙏🏻