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

Toán Lớp 8: rút gọn biểu thức sau B=(x-3)(x^2+3x+()-x*(x-1)*(x+1)-(x+5)

Toán Lớp 8: rút gọn biểu thức sau B=(x-3)(x^2+3x+()-x*(x-1)*(x+1)-(x+5)

Comments ( 1 )

  1. B= (x-3)(x^2 + 3x + 9) – x(x-1)(x+1) – (x+5)
    = x^3 – 27 – x(x^2 – 1) – x – 5
    = x^3 -27 -x^3 + x – x -5
    = ( x^3 – x^3 ) + ( -27 – 5) + (x-x)
    = -32

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