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Daca la dublul unui numar adaugam [tex] \frac{1}{5} [/tex],obtinem - [tex] \frac{ 4}{3} [/tex].Determinati numarul ....

Răspuns :

2x+[tex] \frac{1}{5} =- \frac{4}{3} [/tex]
2x=[tex] \frac{-4}{3} - \frac{1}{5} [/tex]
2x=[tex] \frac{-23}{15} [/tex]
30x=-23
x=[tex] \frac{-23}{30} [/tex]
Fie x numarul deci
2x+1/5=4/3 2x+1=-4/3x5
2a+1=20/3-1
2a=20/2
2a=10=>a=5(p's nu's sigur)