Question

Buna!!!Ma ajutati va rog?
(x+1)+(x+2)+(x+3)+...+(x+50)≥100

Answer 1

X*50+1+2+3+...+50=50x+(50*51)/2=50x+25*51 care rezultat sigur e mai mare ca 100 (25*51)

Answer 2

x+1+x+2+...+x+50=
50x+(1+2+3+....+50)
1+2+...+50=(50x51):2
                  25x51

50x+(25x51)$\geq$ 100           /50
x+(1275)$\geq$ 100 => adevarat