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(1+2+3+....+2012)×1supra2012-1supra2012×2013

Răspuns :

Luckyjr
(1+2012)×2012/:2×1/2012=2013:2

2013/2-1/2012×2013=(2012×2013-2013):2012=2013(2012-1)/2012=2013×2011/2012

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