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

Toán Lớp 6: 1+ 5 + 10 + 15 +-..+ 55 + 60 5* + ctlhn

Toán Lớp 6: 1+ 5 + 10 + 15 +……+ 55 + 60
5* + ctlhn

Comments ( 2 )

  1. 1 + 5 + 10 + 15 + … + 55 + 60
    = 1 + ( 5 + 60 ) + ( 10 + 55 ) + … + ( 30 + 35 )
    = 1 + 65 + 65 + 65 + 65 + 65 + 65
    = 1 + ( 65 × 6 )
    = 1 + 390
    = 391
    @ Rin
     

  2. Gửi cậu ????????‍♀️????‍♀️
    Giải đáp : 391
    Giải chi tiết : 
    1 + 5 + 10 + 15 + … + 55 + 60
    = ( 5 + 55 ) + ( 10 + 50 ) + ( 15 + 45 ) + ( 20 + 40 ) + ( 25 + 35 ) + ( 30 + 60 ) + 1
    = 60 + 60 + 60 + 60 + 60 + 90 + 1
    = 60 × 5 + 91
    = 300 + 91
    = 391

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