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100*{100:[100-(100-a*2)]}+100=600

Răspuns :

100*{100:[100-(100-2a)]}=600-100 100*{100:[100-(100-2a)]}=500 [100:(100-100 + 2b )]=500:100 [100:(0+2a)]=5 2a=5*100 2a=500 a=500:2 A= 250 Sper ca este bine..