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∵直角三角形兩直角邊分別是60cm和80cm,∴斜邊長為602+802=100cm,∴直角三角形的周長為60+80+100=240cm,設斜邊上的高為x,則12×60×80=12×100x解得x=48.即斜邊上的高為48cm.
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