a×42+720- 720 : 9 = 1060a×42+720- 80 = 1060a×42+720 = 1060+80a×42+720 = 1140a×42= 1140-720a×42=420a=420:42a=10
100 -b : 16 +350 : 7 = 144 100 -b : 16 +50= 144 100 -b : 16= 144 -50100 -b : 16=94b : 16=100-94b:16=6b=6×16b=96
E =100 ×a - 10 ×bE =100 ×10 - 10 ×96E=1000-960E=40
Dacă tu crezi că merit, astept coroana!