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x=(1+2+...+2000)/2000*2=
y=(3 la puterea 15 +9 la puterea 7) totu la puterea 2000/ (81) la puterea 500


Răspuns :

x = 2000·2001/2 · 1/(2000·2) = 2001/4
y = (3¹⁵ + 3¹⁴ )²⁰⁰⁰ /3²⁰⁰⁰ = 3²⁸⁰⁰⁰ ₓ4 /3²⁰⁰⁰ = 4ₓ3²⁶⁰⁰⁰