1、已知n是正整数,且2n+1与3n+1都是完全平方数,是否存在n,使得5n+3是质数?如果存在,请求出所有n的值;如果不存在,请说明理由.2、设m为整数,且关于x的方程mx^2+2(m-5)x+m-4=0有整数根,则m的值为

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