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

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

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

Comments ( 2 )

  1. -3x^2+3(x+1)(x-1)
    =-3x^2+3(x^2-1^2)
    =-3x^2+3(x^2-1)
    =-3x^2+3.x^2-3.1
    =-3x^2+3x^2-3
    =-3

  2. -3x^2+3(x+1)(x-1)
    =-3x^2+3(x^2-1)
    =-3x^2+3x^2-3.1
    =(3x^2-3x^1)-3
    =-3

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

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