Răspuns:
[tex]x=\sqrt{19:\frac{21-2}9} } +\sqrt{20:\frac{22-2}{9} }+\sqrt{21:\frac{23-2}{9} } +...+\sqrt{26:\frac{28-2}{9} } =\sqrt{19*\frac{9}{19} }+\sqrt{20*\frac{9}{20} }+\sqrt{21*\frac{9}{21} }+...+\sqrt{26*\frac{9}{26} }=\sqrt{9}+\sqrt{9}+\sqrt{9}+...+\sqrt{9}=3+3+3+...+3=3*8=24[/tex]
Explicație pas cu pas:
