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5.) 25×34-25×33=....
6.) 12+22+32+42=.....


Răspuns :

15*34-25*33=850-825=25
12+22+32+42=108
5) 25*34-25*33=
  25*(34-33)=
  25*1=
  25

6)12+22+32+42=
  34+32+42=
  66+42=
  108