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2019×2018-2018×2017-2×2017+2×2016-2×2015
Folositi factorul comun​


Răspuns :

2019×2018-2018×2017-2×2017+2×2016-2×2015=

2018×(2019-2017)-2×(2017+2016-2015)=

2018×2-2×(4033-2015)=

2018×2-2×2018=

2×(2018-2018)=

2×0=0