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Repedeeee: Daca a+b=2,7 si b+c=8,3,atunci calculati 3a+5b+2c.​

Răspuns :

a+b = 2,7

b+c = 8,3

3a+5b+2c = ?

3(a+b) = 3a+3b = 3×2,7 = 8,1

2(b+c) = 2b+2c = 2×8,3 = 16,6

  • Acum le adunam

3a+3b+2b+2c = 3a+5b+2c = 8,1+16,6 = 24,7