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calculati in doua moduri a. 3x(72+11) 5x(72+11) b.8x(36+14+45) 7x(29+9+15) c. 9x(83-36) 8x(57-38)


Răspuns :

3×(72+11)=3×83=249 sau 3×72+3×11=216+33=249! la fel si la celelalte