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1. Numerele reale a,b,c verifica relatia [tex] \frac{a}{5} - \frac{b}{7} + \frac{c}{11} =3,14[/tex].
Calculati valoarea expresiei E= [tex]3a- \frac{65}{91} ori b+( \frac{ \sqrt{5c} }{ \sqrt{11} } )^{2} -a: \frac{1}{2} [/tex]


Răspuns :

a/5-b/7+c/11=3,14
E=3a-65b/91+(√5c/√11)²-a:1/2=
=3a-5b/7+5c/11-2a=
=a-5b/7+5c/11=
=5a/5-5b/7+5c/11=
=5(a/5-b/7+c/11)=
=5×3,14=15,7