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cum ezolv ecuatia: (x + 1) + (x + 2) + ...(x + 41)= 40x + 860

Răspuns :

Albastruverde12
(x+1)+(x+2)+...+(x+40)=40x+860
x+1+x+2+...+x+40=40x+860
41x+[tex] \frac{40*41}{2} [/tex]=40x+860
41x+820=40x+860
41x-40x=860-820
x=40

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