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四角形のABCDは矩形、AD=BC、AB=CD、A=B=90°、EEED、DEF=90°、AED+ADE=90°、AED+BEF=90°、ADE=BEF、△ADEと△BEFでADE=BEFA=BEE=BF△ADE△BEF,AD=BE,矩形...
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