8abc - abc8 = 5418
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ta ghi ra giấy theo kiểu dọc thẳng ta duoc a = 2 b = 8 c = 6 ket qua la 286
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8abc - abc8 = 5418
8abc = abc8 + 5418
8000 + abc = abc x 10 + 8 + 5418
8000 - 8 - 5418 = abc x 10 - abc
2574 = abc x 9
abc = 2574 : 9 = 286
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8abc - abc8 = 5418
8000 + abc - abc x 10 + 8 = 5418
abc x (10 - 1)= 8000 - 8 - 5418
abc x (10 - 1) = 2574
abc = 2574 : 9
abc = 286
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8abc-abc8 = 5418
8abc= abc8 + 5418
8000+abc= abc x 10 + 8 + 5418
8000 - 8 - 5418 = abc x 10 -abc
2574 = abc x 9
abc = 2574 : 9
abc = 286
tk mk nha mk nhanh nhất
.....
8000 + abc - 10 x abc - 8 = 5418
7992 - 5418 = 10x abc - abc
2574 = 9 x abc
abc = 2574 : 9
abc = 286
vậy 8286 - 2868 = 5418
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kho.....................wa........................lanh.....................wa..................rich...................ung................ho..................minh...............cho.................do......................ret............to.............tich...............lai
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=> 8000+abc = 5418+abc8
8000+abc = 5418+10 x abc+8
8000+abc = 5426+10 x abc
8000-5426 = 10 x abc-abc
2574 = (10-1) x abc
2574 = 9 x abc
2574:9 = abc
286 = abc
ban dung rui