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

Toán Lớp 8: Rút gọn biểu thức biểu thức (x – 2)(2x + 7) – 2x(x – 1) – 5x + 2022

Toán Lớp 8: Rút gọn biểu thức
biểu thức (x – 2)(2x + 7) – 2x(x – 1) – 5x + 2022

Comments ( 2 )

  1. (x-2)(2x+7) – 2x(x-1) – 5x +2022
    = 2x^2 + 7x – 4x – 14 – 2x^2 + 2x – 5x +2022
    = ( 2x^2 – 2x^2 ) + (7x – 4x + 2x -5x) + ( -14 +2022)
    =2008
     

  2. (x-2)(2x+7) – 2x(x-1) – 5x + 2022
    = (2x^2 + 7x – 4x – 14) – (2x^2 -2x)  -5x + 2022
    = 2x^2 + 3x -14 – 2x^2 + 2x -5x+2022
    =(2x^2 – 2x^2) + (3x+2x-5x) – (14 -2022)
    =2008
     

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