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

Toán Lớp 8: Rút gọn biểu thức A= (3x-1) ^2 -9x(x+1)

Toán Lớp 8: Rút gọn biểu thức A= (3x-1) ^2 -9x(x+1)

Comments ( 2 )

  1. (3x-1)^2-9x(x+1)
    =(3x)^2-2.3x.1+1-9x.x-9x.1
    =9x^2-6x+1-9x^2-9x
    =(9x^2-9x^2)-(6x+9x)+1
    =-15x+1

  2. A=(3x-1)^2-9x(x+1)
    A=(9x^2-6x+1)-(9x^2+9x)
    A=9x^2-6x+1-9x^2-9x
    A=(9x^2-9x^2)-(6x+9x)+1
    A=-15x+1
    Vậy A=-15x+1

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

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