Question

pliss dau coroana orice clasa 7 a pliss ​

Answer 1

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