Question

Tìm số abc biết: abc x 9 = 3abc

 

Answer 1

abc.9=3abc

=>abc.9=3000+abc

=>abc.9-abc=3000

=>8abc=3000

=>abc=375

Vậy abc=375

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Answer 2

abc.9=3abc

=>abc.9=3000+abc

=>abc.9-abc=3000

=>8abc=3000

=>abc=375

Vậy abc=375