pliss dau coroana orice clasa 7 a pliss
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Răspuns:
1
Explicație pas cu pas:
1/1·3=1/1·2-1/2·3
1/3·5=1/2·3-1/2·5
1/2011·2013=1/2·2011-1/2·2013
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S=1/2-1/2·2013=1/2·(2013-1)/2013=2012/2·2013=1006·2013
S·2013/1006=1006/2013·2013/1006=1