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

Toán Lớp 8: (4x-1).(x+2)=? Tính xem bằng bao nhiêu ạ?

Toán Lớp 8: (4x-1).(x+2)=? Tính xem bằng bao nhiêu ạ?

Comments ( 2 )

  1. (4x-1)(x+2)
    =(4x.x)+(4x.2)-(1.x)-(1.2)
    =4x^2+8x-x-2
    =4x^2+7x-2
     

  2. $\\$
    (4x-1)(x+2)
    = 4x (x+2)-1(x+2)
    = 4x . x + 4x . 2 – 1 . x – 1 . 2
    = 4x^2 + 8x – x – 2
    = 4x^2 + (8x-x)-2
    = 4x^2 + 7x-2
     

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