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=(a+1-a+1)/(a+1)(a-1)÷a/2(a+1)(a-1)
=2/(a+1)(a-1)×2(a+1)(a-1)/a
=4/a
1年前
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回顾《木兰诗》全文，回答下列问题：
改错别字:换然一新 和霭可亲 相形见拙 鼓惑人心
已知2sinx=1+cosx,则cot(x/2)等于2或0
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Although he failed this time, he didn't give up and ______ studying hard.
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概率题，求解答，非常感谢
已知x=2分之根号5−1 ，求代数式x立方+2x平方-1的值．
