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Iancuteodora30
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Calculati 2a+5b+3c, stiind ca a+b egal 20 si b+c egal 30

Răspuns :

3a+7b+4c= 3(20-b)+7b+4(30-b) = 60-3b+7b+120-4b=180
5a+3b+2c= 5a + 3(33-a) + 2(11-a) = 5a+99-3a+22-2a = 121
2a+2B+3b+3c=2(a+B)+3(B+c)=2*30+3*30=60+90=150

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