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

Toán Lớp 3: 100+22+44+99+30+100+88==-..

Toán Lớp 3: 100+22+44+99+30+100+88=………………

Comments ( 2 )

  1.    100 + 22 + 44 + 99 + 30 + 100 + 88
    = ( 100 + 100 ) + ( 22 + 88 ) + ( 44 + 30 ) + 99
    =    200           +         100     +         74      + 99
    =               300               + 74              + 99  
    =                     374             + 99
    =                    473
     

  2. 100+22+44+99+30+100+88
    = 100 + 30 + 100 + 22 + 44 + 99 + 88
    = 10 x (10 + 3 + 10) + 11 x (4 + 9 + 8)
    = 10 x 23 + 11 x 21
    = 230 + 231
    = 461

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

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