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AP=x、PB=8-x
正方形の和=x²+(8-x)²=36
→ x²+64-16x+x²=36
→ x²-16x+28=0
→ (x-14)(x-2)=0
→ x=14,2 x<8なので、2秒後

なは

とても分かりやすかったです!

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