Răspuns:
a) [tex]\frac{x}{2} =\frac{15}{8}[/tex] => 8x= 30 x= 30/8= 15/4 ( se simplifica prin 2)
b) [tex]\frac{17}{x} =\frac{34}{3}[/tex] => x= [tex]\frac{17*3}{34}[/tex] = [tex]\frac{3}{2}[/tex] ( se simplifica prin 17)
c) n= 19999(19999-999)= 19999* 19000
[tex]\frac{19999*19000}{100x} =\frac{19999}{3}[/tex] x= [tex]\frac{19999*3*19000}{19999*100}[/tex] = 3*190
x= 570