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(a+b+c)²-(a+b-c)²+(c+a-b)²-(b+c-a)²
＝A²-B²+C²-D²
＝(A+B)(A-B)+(C+D)(C-D)
＝(2a+2b)(2c)+(2c)(2a-2b)
＝2c(2a+2b+2a-2b)
＝8ac
Mathematics
Senior High
Resolved
この式の計算をするのに1番効率の良い解き方を教えてください。
(a+b+c?-(b+c-aj?+(c+a-b?-{a+b-c?
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とても分かりやすかったです。
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