Question

VA ROOOG MULT PANA LA ORA 17:30​

Answer 1

Răspuns:

Explicație pas cu pas:

2k-1 ; 2k+1 ; 2k+3 ; 2k+5

(2k+5)³ - (2k-1)(2k+1) +2k+3 = numar impar ?

(2k+5)(4k²+20k+25) - 4k²+1 + 2k+3 =

= 8k³+40k²+50k+20k²+100k+125-4k²+2k+4 =

= 8k³+56k²+152k+129 = numar impar

8k³ = numar par ; 56k² = numar par ;

152k = numar par ; 129 = numar impar .