Question

Va rog urgent !!!!!
Sa se arate ca numerele N=1997+2x(1+2+3+...+1996) Si P=1+3+5+....+1997
DAU COROANAAAAAAA

Answer 1

N=1997 + 2 x [1996 x (1996+1) :2]     
N=1997 + 2 x (1996 x 1997 : 2)         
N=1997 + 2 x (3,986,012 : 2)
N=1997 + 3,986,012
N=3,988,009

P) n {nr. de termeni}                
     n=(1997-1) :2 + 1
     n=1996: 2 +1
     n=998+1
     n=999
P=[(1+1997) x 999]: 2
P=(1998 x 999) : 2
P=1,996,002 : 2
P=998,001