Mathematics
Senior High
(2)の?が書いてある式がわかりません。
(b+c){aの2乗+(b+c)a+bc}+bcaがなぜ
(b+c)aの2乗+{(b+c)の2乗+bc}a+bc(b+c)に
なるのでしょうか。教えてください。
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