计算 1/cos80-根号3/sin80
计算 1/cos80-根号3/sin80
其他人气:238 ℃时间:2020-02-05 02:59:39
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答案:4 先通分然后上面提个2上面就可以化成2倍sin20,然后上面和下面同时乘个2,下面=sin160=sin20,上面是4sin20,sin20约去就是4了
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