91!+90!+89!
=89!(91*90+90+1)
=89!*91^2
因此最大質(zhì)因數(shù)是89能分析一下嗎?沒學(xué)過這個(gè)看不懂這個(gè)是階乘,很把公因式提出來,然后把后面的化簡,最后從連乘中找到最大質(zhì)因數(shù)89
Find the largest prime factor of 91!+90!+89!
Find the largest prime factor of 91!+90!+89!
數(shù)學(xué)人氣:427 ℃時(shí)間:2019-11-17 02:50:45
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