Exercitiul 1 :
a)[tex] \frac{4}{2}= \frac{6}{3} =\ \textgreater \ 4*3 =6*2 ---\ \textgreater \ 12=12 (Adevarat)[/tex] aceasta egalitate de fractii e adevarata.
b)[tex] \frac{5}{7}= \frac{15}{21}=\ \textgreater \ 5*21=7*15 --\ \textgreater \ 105=105 (Adevarat) [/tex] aceasta egalitate de fractie e adevarata.
c)[tex] \frac{1}{12}= \frac{5}{30} =\ \textgreater \ 1*30=12*5 ---\ \textgreater \ 30=30 (Adevarat) [/tex] aceasta e si ea adevarata.
d)[tex] \frac{3}{17} = \frac{6}{34}=\ \textgreater \ 3*34=17*6--\ \textgreater \ 102=102 (Adevarat) [/tex] e adevarata.
e)[tex] \frac{11}{4}= \frac{33}{22}=\ \textgreater \ 11*22=4*34 --\ \textgreater \ 242=136(Falsa) [/tex] aceasta e falsa.
2)[tex] \frac{12}{28} = \frac{3}{7} =\ \textgreater \ 3*28=7*12-\ \textgreater \ 84=84(A)
[/tex]
[tex] \frac{12}{28}= \frac{12}{28} si
\frac{12}{28}= \frac{9}{21} =\ \textgreater \ 12*21=28*9--\ \textgreater \ 252=252(Adevarat) [/tex]
b)[tex] \frac{125}{15}= \frac{125}{15} si \frac{125}{15} = \frac{25}{3} [/tex]
c)[tex] \frac{8}{8} = \frac{7}{7} si /cu \frac{5}{5} sau \frac{3}{3} [/tex]
d)[tex] \frac{1}{3} = \frac{2}{6} sau
\frac{1}{3}= \frac{3}{9} sau
\frac{1}{3}= \frac{4}{12} [/tex]
