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

Toán Lớp 6: thực hiện phép tính sau : 87 . 23 + 13 – 97 + 70 . 87

Toán Lớp 6: thực hiện phép tính sau : 87 . 23 + 13 – 97 + 70 . 87

Comments ( 2 )

  1. 87 . 23 + 13 – 97 + 70 . 87
    = 87 . 23 + (13 – 97) + 70 . 87 
    = 87 . 23 – 84 + 70 . 87
    = 87 . (23 + 70) – 84
    = 87 . 93 – 84
    = 8091 – 84 = 8007

  2. 87 . 23 + 13 – 97 + 70 . 87
    = 87 x ( 23 + 70 ) + 13 – 97
    = 87 x 93 + 13 – 97
    = 8091 + 13 – 97
    = 8104 – 97
    = 8007
     

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

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