質(zhì)數(shù)加質(zhì)數(shù)等于質(zhì)數(shù)還是合數(shù)?合數(shù)加合數(shù)等于質(zhì)數(shù)還是合數(shù)? 質(zhì)數(shù)加合數(shù)呢?

數(shù)學(xué)人氣：130 ℃時間：2019-08-19 20:18:02

優(yōu)質(zhì)解答

質(zhì)數(shù)加質(zhì)數(shù)可能是質(zhì)數(shù),也可能是合數(shù).例如2是質(zhì)數(shù),3是質(zhì)數(shù),2+3=5也是質(zhì)數(shù).3是質(zhì)數(shù),5是質(zhì)數(shù),3+5=8是合數(shù).合數(shù)+合數(shù)可能是合數(shù),也可能是質(zhì)數(shù),例如4是合數(shù),6是合數(shù),4+6=10是合數(shù).4是合數(shù),9是合數(shù),4+9=13是質(zhì)數(shù).質(zhì)數(shù)+合數(shù)...