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Aflati numarulnatural x astfelincat fiecare dintre urmatoarele egalitati sa fie adevarate a)3supra5=xsupra 10b)7suprax=21supra15c)x+2suprax+7=3x+6supra48

Răspuns :

 [tex]a).\;\frac{3}{5}=\frac{x}{10} \;\;\rightarrow\;\;x=\frac{3*10}{5}=6\;;\\
b).\;\frac{7}{x}=\frac{21}{15}\;\rightarrow\;x=\frac{15*7}{21}=5\;;\\
c).\;\frac{x+2}{x+7}=\frac{3x+6}{48}\;\\
\rightarrow\;\frac{48(x+2)}{(x+7)(3x+6)}=\\
\frac{48(x\not+2)}{3(x\not+2)(x+7)}=\frac{16}{x+7}\\
[/tex]