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

Toán Lớp 8: Rút gọn B= $\frac{1}{x-1}$ -$\frac{x}{1-x^3}$ .$\frac{x^2+x+1}{x+1}$

Toán Lớp 8: Rút gọn
B= $\frac{1}{x-1}$ -$\frac{x}{1-x^3}$ .$\frac{x^2+x+1}{x+1}$

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải:
    B = 1/(x – 1) – x/(1 – x^3) . (x^2 + x + 1)/(x + 1)
    B = 1/(x – 1) + x/(x^3 – 1) . (x^2 + x + 1)/(x + 1)
    B = 1/(x – 1) + x/[(x – 1)(x^2 + x + 1)] . (x^2 + x + 1)/(x + 1)
    B = 1/(x – 1) + x/[(x – 1) . (x + 1)]
    B = (x + 1)/[(x + 1)(x – 1)] + x/[(x – 1) . (x + 1)]
    B = (x + 1 + x)/[(x + 1)(x – 1)]
    B = (2x + 1)/[(x + 1)(x – 1)]

  2. Giải đáp + giải thích các bước giải:
    B = 1/(x – 1) – x/(1 – x^3) . (x^2 + x + 1)/(x + 1)
    B = 1/(x – 1) + x/(x^3 – 1) . (x^2 + x + 1)/(x + 1)
    B = 1/(x – 1) + x/[(x – 1)(x^2 + x + 1)] . (x^2 + x + 1)/(x + 1)
    B = (x + 1)/[(x + 1)(x – 1)] + x/[(x – 1) . (x + 1)]
    B = (x + 1)/[(x + 1)(x – 1)] + x/[(x – 1) . (x + 1)]
    B = (2x + 1)/[(x + 1)(x – 1)]
     

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