Mathematics
Senior High
Solved
これはこうべきの順じゃないと減点ですか?
例題
4
(2) (a+2b+3c)(a − 2b+3c)
= {(a +3c)+2b}{(a +3c)-2b}
= (a +3c)² - 46²
= (a² +6ac +9c²) — 4b²
a²-4b²+9c² +6ac
IL
Answers
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ありがとうございます