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

Toán Lớp 8: Rút gọn biểu thức: b(x-3)(x+3)-(2x+1)mũ 2

Toán Lớp 8: Rút gọn biểu thức: b(x-3)(x+3)-(2x+1)mũ 2

Comments ( 2 )

  1. (x-3)(x+3) – (2x+1)^2
    = x^2 – 9 – ( 4x^2 +4x+1)
    = (x^2 – 4x^2) -(9 +1) -4x
    = -3x^2 -4x -10 
     

  2. b, (x-3)(x+3) – (2x+1)^2
    = (x^2-3^2) – (4x^2 + 4x + 1)
    = x^2 – 9 – 4x^2 – 4x – 1
    = (x^2-4x^2) – 4x – (1+9)
    = -3x^2-4x-10

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