Răspuns:
Explicație pas cu pas:
a) 2019(2019-2020)=2019×(-1) =-2019
b) 2019(2019-2018)=2019×1=2019
c) [(5+2020)×404:2] -[5×(1+404)×404:2]
[(5+2020)×403:2]-[(5+2020)×404:2)]=(2025×404:2)-(2025×404:2)=
(2025×202)-(2025×202)=
2025(202-202)=
2025×0
=0
