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a+b=9 si b+c=12 calculati 17a+ 5c+22b

a+b=31 si b+c =67 calculati 5a +8b +3c

Răspuns :

Mihaelaava
daca a+b=9 si b+c=12 calculati
17a+ 5c+22b=17(9-b)+5(12-b)+22b=153-17b+60-5b+22b=153+60=213
a=9-b
c=12-b

Daca a+b=31 si b+c=67  calculati
 5a+8b+3c=5(31-b)+8b+3(67-b)=155-5b+8b+201-3b=155+201=356
a=31-b
c=67-b

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