Răspuns:
a) 7d= [tex]\frac{6}{10} *\frac{5}{3}[/tex] 7d= [tex]\frac{2}{2}[/tex] 7d=1 => d= 1/7
b) c*[tex]\frac{12+1}{3}[/tex]= [tex]\frac{3}{9} *\frac{25}{10}[/tex] c*[tex]\frac{13}{3} = \frac{1}{3} * \frac{5}{2}[/tex] => c= [tex]\frac{5}{6} *\frac{3}{13}[/tex]= [tex]\frac{5}{26}[/tex]
c) [tex]\frac{x}{3} = 4*\frac{6+1}{3}[/tex] [tex]\frac{x}{3} = \frac{4*7}{3}[/tex] x= [tex]\frac{28*3}{3}[/tex] x= 28
d) x= [tex]\frac{4.5*0.4}{1.2*0.5}[/tex]= [tex]\frac{9}{3}[/tex]= 3
e) 2,(3)= [tex]\frac{23-2}{9}= \frac{21}{9} = \frac{7}{3}[/tex] 0,1 (6)= [tex]\frac{16-1}{90} = \frac{15}{90} =\frac{1}{6}[/tex]
13x= [tex]\frac{13}{10} *\frac{1}{6} *\frac{7}{3}[/tex] 13x= [tex]\frac{13}{14*10}[/tex] x= [tex]\frac{14*10*13}{13}[/tex] = 14*10= 140
