Dacă 2a+5b=18 și 2b+c=9, calculați 4a+4b-3c.
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Răspuns:
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2b+c=9=> c=9-2b |*3=> 3c=27-6b
4a+4b-3c= 36-10b+4b-27+6b= 9-10b+10b= 9