Mathematics
Senior High
最後の２行目から最後の行で2ACから2CAに変わっているのは何故ですか？
35 (1) a-b= M とおくと
(a-b+c)²=(M+c)²
= M² +2Mc+c²
=(a−b)²+2(a - b)c+c²
=(a²-2ab+b²)+(2ac-2bc)+c²
=a²+b²+c²-2ab-2bc+2ca
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