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calculati 2*a+9*b+3*c daca a+3*b=35, b+c=17

Răspuns :

Albastruverde12
a+3b=35     |*2
2a+6b=70

b+c=17     |*3
3b+3c=51
 
 2a+9b+3c=2a+6b+3b+3c=(2a+6b)+(3b+3c)=70+51=121. 
CarMina03
2*a+9*b+3*c=2*a+6*b+3*b+3*c=2*(a+3*b)+3*(b+c)=2*35+3*17=70+51=121

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