题目内容

(本小题满分14分,每小题7分)
化简下列各式:
(1) ; (2)

(1)0
(2)1

(1) 解:原式=························································ 2分
=·················································· 4分
=·········································································· 6分
=" 0···················································································" 7分
(2) 解:原式=············································ 4分
="1····································" 7分
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