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Sa se calculeze suma S=1/1*2+2/2*4+3/4*7+...+10/46*56. Clasa a 5a . Multumesc

Răspuns :

Răspuns:

S = [ (1/1) - (1/2) ] + [ (1/2) - (1/4) ] + [ (1/4) -(1/7) ] +.......[ (1/46) - (1/56) ]

S = 1/1 - 10/46*56

S = [ (46*56) -10 ] / ( 46*56)