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

Toán Lớp 8: (9x-1)(9x+1)-(1-5x)^2-9(1-9x^2)

Toán Lớp 8: (9x-1)(9x+1)-(1-5x)^2-9(1-9x^2)

Comments ( 2 )

  1. (9x-1)(9x+1)-(1-5x)^2-9(1-9x^2)
    =81x^2-11-1+10x-25x^2-9+81x^2
    =137x^2-11+10x
     

  2. (9x-1)(9x+1)-(1-5x)^2-9(1-9x^2)
    =81x^2-1-1+10x-25x^2-9+81x^2
    =137x^2+10x-11
     

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