Mathematics
Senior High

次の式を因数分解せよ。
(7)どうやったら1行目の形から2行目の形に変わるのかわからないので教えていただきたいです!

4) (7) (a+bXb+cXc + a) + abc 2 = (b + c) a ³²+ ) (b + c)² + b c y a + b c (b + c) b + c 1 x fc sc C b+c - (0+ c)² 2 =} (b + c)a+ bc} (a+b+c) = (ab+ bc+ ca)(a + b + c)

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