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

Toán Lớp 8: Rút gọn biểu thức B=(2x+1)^2-(3-x)(3+x)

Toán Lớp 8: Rút gọn biểu thức B=(2x+1)^2-(3-x)(3+x)

Comments ( 2 )

  1. B = (2x + 1)² – (3 – x).(3 + x)
       = (4x² + 4x + 1) – (9 – x²)
       = 4x² + 4x + 1 – 9 + x²
       = 5x² + 4x – 8
     

  2. B=(2x+1)^2-(3-x)(3+x)
    =4x^2+4x+1-9+x^2
    =5x^2+4x-8

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

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