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100×{100:[100-(100-a×20)]}+100=600

Răspuns :

MadyR
100×{100:[100-(100-a×20)]}+100=600
100×{100:[100-(100-a×20)]}=600-100
100×{100:[100-(100-a×20)]}=500
{100:[100-(100-a×20)]}=500:100
{100:[100-(100-a×20)]}=5
[100-(100-a×20)]=100:5
[100-(100-a×20)]=20
(100-a×20)=100-20
(100-a×20)=80
a×20=100-80
a×20=20
a=20:20
a=1

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