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rezolvati fractia 5pe21-3pe14+2pe7

Răspuns :

I . calculam numitorul comun ...
     21 = 3*7
     14 = 2*7
   -----------------
c.m.m.m.c.=2*3*7 = 42;
II. [tex]\frac{^{2)}5}{21}\,-\,\frac{^{3)}3}{14}+\frac{^{6)}2}{7}=\frac{10-9+12}{42}=\frac{13}{42}.[/tex]