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13 calculati 16 supra 21 + 3 supra28 + 1 supra 42



Răspuns :

Explicație pas cu pas:

16/21+3/28+1/42

16/21×2+3/28+1/42

32/42+3/28+1/42

33/42+3/28

33/42×2+3/28×3

66/84+9/84

75/84:3=25/28