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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
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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kho.....................wa........................lanh.....................wa..................rich...................ung................ho..................minh...............cho.................do......................ret............to.............tich...............lai
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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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a,abc7+5778=7abc
abc x 10+7+5778=7000+abc
abc x 10-abc=7000-5778-7
abc x (10-1)=1215
abc x 9=1215
abc=1215:9
abc=135
b,8abc-abc8=5418
8000+abc=5418+abc8
8000+abc-5418=abc x 10+8
8000-5418-8=abc x 10-abc
2574=abc x (10-1)
2574=abc x 9
2574:9=abc
abc=286
c,1abc=abc x 9
1000+abc=abc x 9
1000=abc x 9-abc
1000=abc x (9-1)
1000=abc x 8
abc=1000:8
abc=125
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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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