Question

Berapakah nilai dari 1/1.2 +1/2.3 + 1/3.4 + 1/4.5 +…+1/2014.2015 ???

Answer 1

1/1.2 +1/2.3 + 1/3.4 + 1/4.5 +…+1/2014.2015 =??
1/1.2 = 1/1 - 1/2
1/2.3 = 1/2 - 1/3
1/3.4 = 1/3 - 1/4
1/4.5 = 1/4 - 1/5

1/2013=1/2013 - 1/2014
1/2014.2015 = 1/2014 - 1/2015
========================= (+)
sisanya = 1 -1/2015 = 2014/2015

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