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

Toán Lớp 8: 1-9x+27x^2-27x^3 giúp mik nka

Toán Lớp 8: 1-9x+27x^2-27x^3
giúp mik nka

Comments ( 2 )

  1. 1-9x+27x^2-27x^3
    =-(27x^3-27x^2+9x-1)
    =-[(3x)^3-3*(3*x)^2*1+3*3x*1^2-1^3)]
    =-(3x-1)^3
     

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

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