Nicolunguask
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2 • (1+2+3+...+2019) : 2020
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Răspuns :

Vojojo4020ask

s= 2019(2019+1)/2

s= 2019•2020/2

s= 4078380/2

s= 2039190

2•(1+2+3+........+2019):2020=

2• 2039190: 2020=

4078380:2020= 2019

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