勾股定理中为什么a平方减b平方等于c平方，它原来不是a平方加b平方等于c平方吗？请说出详细理由我数 勾股定理是不是a平方加b平方等于c平方
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一般来说是a平方加b平方等于c平方但是如果斜边是a的话，那么就是a平方减b平方等于c平方
只要记得一点，直角边的平方和等于斜边的平方
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绛旓細c^2-b^2 c^2-a^2
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绛旓細鍒╃敤鍒囧壊绾瀹氱悊璇佹槑锛氬湪Rt螖ABC涓紝璁剧洿瑙掕竟BC = a锛孉C = b锛屾枩杈笰B = c. 濡傚浘锛屼互B涓哄渾蹇僡涓哄崐寰勪綔鍦嗭紝浜B鍙夾B鐨勫欢闀跨嚎鍒嗗埆浜嶥銆丒锛屽垯BD = BE = BC = a. 鍥犱负鈭燘CA = 90º锛岀偣C鍦ㄢ姍B涓婏紝鎵浠C鏄姍B 鐨鍒囩嚎. 鐢卞垏鍓茬嚎瀹氱悊锛屽緱 AC^2=AE路AD =(AB+BE)(AB-BD)=(c...
