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Alexgamerboi
a fost răspuns

daca 2a + 3b =91 si 2b +7c = 73 calculati 6a + 13b + 14c si 12a +4b - 49c

Răspuns :

Ramonanyka

2a + 3b =91

2b +7c = 73

6a + 13b + 14c= 6a+9b+4b+14c=3x(2a+3b)+2x(2b+7c)=3x91+2x73=273+146=419

12a +4b - 49c=12a+18b-14b-49c=6x(2a+3b)-7x(2b+7c)=6x91-7x73=546-511=35

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