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

Toán Lớp 6: f) (29 – 9). (– 9) + (–13 – 7). 21 h) 12.( –47) + 12.( –19) + (–66).88

Toán Lớp 6: f) (29 – 9). (– 9) + (–13 – 7). 21
h) 12.( –47) + 12.( –19) + (–66).88

Comments ( 2 )

  1. f) (29 – 9). (– 9) + (–13 – 7). 21
    = 20.(-9) + (-20).21
    = 20(-9) – 20.21
    = 20(-9-21)
    = 20.(-30)
    = -60
    h) 12.( –47) + 12.( –19) + (–66).88
    = 12.(-47-19) + (-66).88
    = 12.(-66) + (-66).88
    = (-66).(12 + 88)
    = (-66).100
    = -6600
     

  2. f) (29 – 9) . (-9) + (-13 – 7) . 21
    = 20 . (-9) + (-20) . 21
    = 20 . [-9 + (-21)]
    = 20 . (-30)
    = -600
    ________________________________
    h) 12 . (-47) + 12 . (-19) + (-66) . 88
    = 12 . [(-47) + (-19)] + (-66) . 88
    = 12 . (-66) + (-66) . 88
    = (-66) . (12 + 88)
    = (-66) . 100
    = -6600

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

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