已知一个数的两个平方根是2a+1 和3a-5 求这个数.
人气：308 ℃ 时间：2020-03-27 14:43:19
解答
(2a+1 )+(3a-5)=0
a=4/5
2a+1=13/5
所以此数为169/25
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