Gọi số cần tìm là abcde
Theo bài ra ta có :
2abcde x 3 = abcde2
(200000 + abcde) x 3 = abcde x 10 + 2
600000 + abcde x 3 = abcde x 10 + 2
600000 - 2 = abcde x (10 - 3)
599998 = abcde x 7
=> abcde = 599998 : 7
=> abcde = 85714
Vậy số cần tìm là 85714
Ủng hộ mk nha !!! ^_^
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