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ajutatima va rog la exercitii 7supra12 +5supra18=? 15supra16-3supra4=? -3supra14+2supra21=?

Răspuns :

7/12 +5/18=(21+10) /36=31/36

15/16-3/4=(15-12)/16=3/16
 
-3/14+2/21=(-9+4)/42=-5/42