Mathematics
Junior High

この問題の途中式の解説してもらえませんか🙇‍♀️

(x+y +9) (X+Y-1) =a²+2ab²-49

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問題の文字がxとyなのに
答えがaとbなのは明らかに無理があります
違う問題の答えでは?

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