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a fost răspuns

Rezolvati in Q ecuatia: x+2x+3x+...+100x=-1+2-3+4-...-201+202

Răspuns :

Albatran
x(1+2+...+100)=x*100*101/2
atunci


x* 100*101/2=1+1+....+1de 202/2=101ori
50x*101=101
50x=1
x=1/50∈Q

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