Question

酢豚

この式になる理由を教えてください🙇

(3) (a+b+c) (ab + bc+ca)- abc 1 M
= {a + (b + c)} {(b + c)a + bc} - abc
= (b + c)a² + {(b + c)² + bc-bc} a + bc(b + c)
(b + c)a² + (b + c)²a + bc(b + c)
(b + c) {a² + (b + c)a + bc}
= (b + c)(a + b)(a + c) = (a + b)(b + c)(c + a)

Answer 1

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♪(๑ᴖ◡ᴖ๑)♪

(b+c)でくくってます。

酢豚

あ！なるほど！！ありがとうございます🙇