中科新闻网爷们小说静水边:初一数学题
来源：百度文库 编辑：中科新闻网 时间：2024/05/08 23:51:40
数3^48-1能被30以内的两位偶数整数，这样的整数是哪几个？说明理由
3^48-1
=(3^24+1)(3^24-1)
=(3^24+1)(3^12+1)(3^12-1)
=(3^24+1)(3^12+1)(3^6+1)(3^6-1)
=(3^24+1)(3^12+1)(3^6+1)(3^3+1)(3^3-1)
3^3+1=28
3^3-1=26
是26和28
看不懂题目啊
3^48-1
=(3^24+1)(3^24-1)
=(3^24+1)(3^12+1)(3^12-1)
=(3^24+1)(3^12+1)(3^6+1)(3^6-1)
=(3^24+1)(3^12+1)(3^6+1)(3^3+1)(3^3-1)
3^3+1=28
3^3-1=26
是26和28