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Daca a+b+203, b+c=185, atunci a+2b+c= ?
urgent !


Răspuns :

Daca a+b=203
B+c=185
Adunam ambele adunari
A+b+b+c=203+185
A+2b+c=388
a+b=203
b+c=185
Adunam cele doua relatii si observam ceva:
a+b+b+c=a+2b+c=203+185
=> a+2b+c=388