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

Toán Lớp 6: tính hợp lý 34.(26-15)-26.(34-15) Mong mọi người giúp

Toán Lớp 6: tính hợp lý 34.(26-15)-26.(34-15)
Mong mọi người giúp

Comments ( 2 )

  1.        34.(26-15)-26.(34-15)
    <=>(15-15).(26-26).(34+34)
    <=>0.0.68
    <=>0

  2. 34 . (26 – 15) – 26 . (34 – 15)
    = 34 . 26 – 34 . 15 – 26 . 34 + 26 . 15
    = (34 . 26 – 26 . 34) – (34 . 15 – 26 . 15)
    = 0 – 15 . (34 – 26)
    = 0 – 15 . 8
    = 0 – 120
    = -120
     

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

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