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

Toán Lớp 8: thực hiện phép tính : (x+1)^2+(x-2).(x+3)-4x

Toán Lớp 8: thực hiện phép tính :
(x+1)^2+(x-2).(x+3)-4x

Comments ( 2 )

  1.     (x+1)^2 + (x-2).(x+3) – 4x
    = x^2 + 2x + 1 + x^2 + 3x – 2x – 6 – 4x
    = 2x^2 – x – 5

  2. (x+1)^2 + (x-2).(x+3) – 4x
    = x^2 + 2x + 1 + x^2 + 3x – 2x – 6 – 4x
    = ( x^2 + x^2 ) + ( 2x + 3x – 2x – 4x ) + ( 1 – 6)
    = 2x^2 – x -5

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