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Ajutooor la 2 plssssss

Ajutooor La 2 Plssssss class=

Răspuns :

Răspuns:

a+b+c= 12

Explicație pas cu pas:

2a+3b+4c=45

4a+3b+2c=27      / *2

a+b+c=??

8a+6b+4c= 54

2a+3b+4c=45

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6a+ 3b=9       | :3

2a+ 1b=3

2a+3b+4c=45

3+ 2b+4c=45

2b+4c=42  |:2

1b+2c= 21

=> 2a+1b+1b+2c=21+3

2a+2b+2c=24   |:2

a+b+c= 12