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(左辺)−(右辺)=(ay−bx)²≧0なので、(左辺)−(右辺)=0つまり(ay−bx)²=0のときに等号が成立します。
(ay−bx)²=0よりay−bx=0 ∴ay=bx

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理解出来ましたありがとうございます😭

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