若且，求x，y的值．

【解析】【解析】 ∵ x，y≠ 0，∴ xy≠ 0， ∴lg(xy)=0，∴xy=1，······································································ 3分即为{x，1，0}={0，|x|，y}，若y=1，则x=1，不合题意，·························· 5分 ∴····················································································· 7分解得：（舍去），，······················································· 8分 ∴x=-1，y=-1．············································································· 9分

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(本小题满分16分，每小题8分)

解下列不等式：

(1) ； (2) log₇3x < log₇(x²-4)．