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問題が多いので、概略です

(5)長い辺(x)、短い辺(12-x)、ただし(6<x<12)

  x²+(12-x)²=(4√5)² を解いて、長い辺x=8

(6)一方の辺(x)、他方の辺(9-x)、ただし(0<x<9)

  x(9-x)=18 からx=3,6 対角線√{3²+6²}=3√5

しろ

ありがとうございます😭😭

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