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a+b=33,a+c=11,calculați 5×a+3×b+2×c


Răspuns :

Răspuns:

a+b=33 I·3

3a+3b=99

a+c=11 I·2

2a+2c=22

3a+3b+2a+2c=99+22

5a+3b+2c=121