ex 22 va rog mult ..
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Răspuns:
-2018-2017-...-1+0+1+2+...+2017+2018+2019=2019 ; restul se reduc ; suma lui gauss ; (1+2018)2018/2 =2019 . 1009 ; (1+2019) .2019/2= 2020 .2019/2=1010 .2019 ; 2019 .1009+2019 .1010= 2019 (1009+1010)=2019 .2019=2019²
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