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設三角形三邊的長分別為a-d,a,a+d,則依題意有(a−d)+a+(a+d)=36(1)18(18−a+d)(18−a)(18−a−d)=54(2)由(1)得a=12(cm).代入(2)得18(6+d)•6•(6−d)=54,36-d2=27,d2=9d=±3故此三角形的三邊長分別為9cm,12cm,15cm.
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