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11+12+...+100=5(1000x-1)

Răspuns :

[tex]11+12+13+....+100=5000x-5 \\ \\ \frac{90(100+11)}{2}=5000x-5 \\ \\ 111*45=5000x-5 \\ \\ 4995=5000x-5 \\ \\ 5000x=5000 \\ \\ x=1 [/tex]