Question

EX 15 VREAU EXPLICATIE LA MODUL DE REZOLVARE PLS!!!!!!

Answer 1

Răspuns:

Explicație pas cu pas:

1/1*2 = 1/1 - 1/2

1/2*3 = 1/2 - 1/3

.......

1/24*25 = 1/24 - 1/25

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1/1*2 + 1*2*3 + ... + 1/24*25 = 1/1 - 1/2 + 1/2 - 1/3 + ... + 1/24 - 1/25

= 1/1 - 1/25 = 25/25 - 1/25 = 24/25

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1/25*26 = 1/25 - 1/26

1/26*27 = 1/26 - 1/27

........

1/49*50 = 1/49 - 1/50

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1/25*26 + 1/26*27 + ... + 1/49*50 = 1/25 - 1/26 + 1/26 - 1/27 + ... + 1/49 - 1/50

= 1/25 - 1/50 = 2/50 - 1/50 = 1/50

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24/25 - 1/50 = 48/50 - 1/50 = 47/50

1/94*47/50 = 1/100

x = √1/100 = 1/10 ∈ R