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Calculati ssuma tuturor numerelor care impartite la 5 dau catul 6.

Răspuns :

n:5=6

r<5
r=0 , 1 , 2 , 3 , 4
n=6x5+0=30
n=6x5+1=31
n=6x5+2=32
n=6x5+3=33
n=6x5+4=34
R: 30+31+32+33+34=160
a1:5=6 a1=30 a2:5=6r1 a2=31 a3:5=6r2 a3=32 Analog a4=33;a5=34.......a1+a2+...+a5=160