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Dau coroana! Exercitiul 2. Va rog! ​

Dau Coroana Exercitiul 2 Va Rog class=

Răspuns :

a) 2019*2019-2019*2020=
=2019(2019-2020)=
=2019*(-1)=
=-2019

b) 2019*2019-2018*2019=
=2019(2019-2018)=
=2019*1=
=2019

c) 5+10+15+...+2020-5(1+2+3+...+404)=
=5(1+2+3+...+404)-5(1+2+3+...+404)=
=0
CaptainPhasmaask

a) 2019^2 - 2019*2020 = 2019*2019 - 2019*2020= 2019*(2019-2020) = 2019×(-1) = - 2019

b) 2019^2 - 2018*2019 = 2019*(2019 - 2018) = 2019 * 1 = 2019

c) 5 + 10 + 25 +... +2020 - 5*(1+2+3+...+404) = 5*(1+2+3+...+404) - 5*(1+2+3+...+404) = 0

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