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Ghitacrasnai
a fost răspuns

afla valorile literelor a b c stiind ca ;a]10a+10b+10c =2530 a+b=196 a+c=177                              b]5a+2b+2c=70 3a+2b=44  c=3

Răspuns :

Andreea2004
a) 10a+10b+10c =2530 => 10(a+b) +10c=2530 => 10*196+10c=2530 =>
10c=2530-1960=570 => c=57
a+b=196  => 120+b=196 => b=196-120=76
a+c=177 => a+57=177 => a=177-57=120 

b) ]5a+2b+2c=70
     3a+2b=44  
    c=3 => 5a+2b=70-6=64 (1)
                3a+2b=44 (2)
scadem cele 2 relatii (1)-2) si obtinem 
5a-3a+2b-2b=64-44
2a=20 => a=10
3a+2b=44 =>30+2b=44 => 2b=14 => b=7

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