Mathematics
Senior High
高1数学です。
(2)の解き方を教えてください。
215 次の式を計算せよ。
(1) (a+b+c)2- (b+c-a)²+(c+a-b)²-(a+b-c)²
(2) (a-b+c)(a+b2+c+ab+bc-ca)
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