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(4supra7+5supra7)•(10supra27+4supra27)=

Răspuns :

[tex]( \frac{4}{7} + \frac{5}{7} ).( \frac{10}{27}+ \frac{4}{27} )= \frac{9}{7} . \frac{14}{27} = \frac{2}{3}[/tex]
Sper ca te-am ajutat !