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

Toán Lớp 4: Tính bằng cách thuận tiện nhất:11+22+44+55+56+67+78+89

Toán Lớp 4: Tính bằng cách thuận tiện nhất:11+22+44+55+56+67+78+89

Comments ( 2 )

  1. 11+22+44+55+56+67+78+89
    = (11+89)+(22+78) +(44+56)+(55+67)
    = 100 + 100+100+122
    = 422
     

  2. 11+22+44+55+56+67+78+89
    = [ 11 + 89 ] + [ 22 + 78 ] + [ 44 + 56 ] + [ 55 + 56 ]
    = 100 + 100 + 100 + 101
    = 401
     

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

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