Răspuns:
4. a) [tex]\frac{1*1}{4*5} = \frac{1}{20}[/tex]
b) [tex]\frac{3*2}{7*11} =\frac{6}{77}[/tex]
c) [tex]\frac{1*5}{8*2}[/tex]= [tex]\frac{5}{16}[/tex] ( am simplificat 6 cu 3)
d) [tex]\frac{5*1}{3*4} = \frac{5}{12}[/tex] ( am simplificat 9 cu 3)
e) [tex]\frac{1*1}{3*2} = \frac{1}{6}[/tex] ( am simplificat 14 cu 7 si 15 cu 5)
f) [tex]\frac{1*1}{2*4} = \frac{1}{8}[/tex] ( am simplificat 20 cu 5 si 6 cu 3)
5. [tex]\frac{1}{3} *\frac{3}{4}[/tex] = [tex]\frac{1}{4}[/tex]
[tex]\frac{1}{4} * \frac{4}{5}[/tex]= [tex]\frac{1}{5}[/tex]
[tex]\frac{1}{5} *\frac{5}{6} =\frac{1}{6}[/tex]
[tex]\frac{1}{6} *\frac{6}{7} =\frac{1}{7}[/tex]
