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Exercitiu cu factorul conun:
a+b+c=18
2a+2c=5
(a+c)×3a+2b+3c=?

Urgent Va rog raspundeti.Nimeni?


Răspuns :

a+b+c=18
2a+2c=5
2a+2b+2c=18x2=36
2b=36-5=31
b=31:2
b=15.5