Mathematics
Senior High
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赤丸で囲った部分は下の式に行くと無くなっているのですがどこに行ったのですか?

2y 47 -(y-1) y -11 3y+1 =(x+2y) (2 =G+21) (22 1=(x+2g)( 77+27) 2x² +(3y+1)(7) 27 (y-1) 2 24 (メ 4y 3y+1 =(x+2g){(2x-(y-1)} =(x+2y) (2x-4+1)

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✨ Best Answer ✨

青丸同士の掛け算
黄丸同士の掛け算
をすると出てくる

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