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Warrior657
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Daca a+b=5 si b+c=7 atunci 2a+5b+3c cat face ?

Răspuns :

a+b=5 | ×2
b+c=7 | ×3
__________
2a+2b=10 +
3b+3c=21
___________
2a+5b+3c=10+21
2a+5b+3c=31
a+b=5 / *2
b+c=7 / *3
--------------(+)
2a+2b+3b+3c=10+21
2a+5b+3c=31


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