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Primul ex .Calculati in doua moduri . Va rog

Primul Ex Calculati In Doua Moduri Va Rog class=

Răspuns :


a 2/3x1/7+2/3x5/14=2/21+5/21=1/3
   2/3x1/7+2/3x5/14=2/21+10/42=14/42=1/3
b 6/7+8/7=14/7=2
   3x2/7+4x2/7=(3+4)x2/7=14/7=2