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300 X 25K + 200 X 20K - 600 = 6000

Răspuns :

7500K+4000K-600=6000
11500K=6600
K=6600/11500=66/115


12.25.25K+8.25.20K-24.25=240.25(impartim la 25.4)
75K+40K-6=60
115K=66
k=66/115