摘要： 解:(1)．····················································································· 3分 (2)相等.比值为．················· 5分(无“相等 不扣分有“相等 .比值错给1分) (3)设. 在矩形中.. . . . . ．···································································································· 6分 同理． . . ．······························································································· 7分 . .······························································································ 8分 解得． 即．······································································································ 9分 (4).·············································································································· 10分 ． 12分

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