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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 4: tim số tự nhiên abc biêt abc x 9 = 1 abc

Toán Lớp 4: tim số tự nhiên abc biêt abc x 9 = 1 abc

Comments ( 2 )

  1. \overline{abc} × 9 = \overline{1abc}
    \overline{abc} × 9 = 1000 + \overline{abc}
    \overline{abc} × 9 – \overline{abc} = 1000
    \overline{abc} × ( 9 – 1 ) = 1000
    \overline{abc} × 8 = 1000
    => \overline{abc} = 1000 : 8 = 125
    Vậy \overline{abc} = 125
    #dtkc
     

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222-9+11+12:2*14+14 = ? ( )