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

Toán Lớp 6: (-89) + (-51) + 99 + (-37) + 61 + (-23) + 47 + 33

Toán Lớp 6: (-89) + (-51) + 99 + (-37) + 61 + (-23) + 47 + 33

Comments ( 2 )

  1. (-89) + (-51) + 99 + (-37) + 61 + (-23) + 47 + 33
    = [-89 + (-51)] + (99 + 61) + [-37 + (-23)] + (47 + 33)
    = -140 + 160 + (-60) + 80
    = -140 + 100 + 80 
    = -140 + 180
    = 40
     

  2. \text{(-89) + (-51) + 99 + (-37) + 61 + (-23) + 47 + 33}
    \text{= [(-89) + 99] + [61 + (-51)] + [33 + (-23)] + [47 + (-37)]}
    \text{= (99 – 89) + (61 – 51) + (33 – 23) + (47 – 37)}
    \text{= 10 + 10 + 10 + 10}
    \text{= 40.}

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