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12. daca a+b=24si b+c=5 calculati
a. a+2b+c
b. 2a+5b+3c
c.3a+7b+4c

Răspuns :

Ale2662
a)a+2b+c=(a+b)+(b+c)=24+5=29
b)2a+5b+3c=(2a+2b)+(3b+3c)=2(a+b)+3(b+c)=2x24+3x5=48+15=63
c)3a+7b+4c=(3a+3b)+(4b+4c)=3(a+b)+4(b+c)=3x24+4x5=72+20=-92

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