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

Toán Lớp 8: nhanh nha `(3x^2 +8x)/(x^3 -1) + (2)/(x^2 +x+1) + (3)/(1-x)`

Toán Lớp 8: nhanh nha
(3x^2 +8x)/(x^3 -1) + (2)/(x^2 +x+1) + (3)/(1-x)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     (3x²+8x)/(x³-1) +2/(x²+x+1) +3/(1-x)
    = (3x²+8x)/((x-1)(x²+x+1)) +(2(x-1))/((x-1)(x²+x+1)) -(3(x²+x+1) )/((x-1)(x²+x+1))
    =(3x²+8x)/((x-1)(x²+x+1)) +(2x-2)/((x-1)(x²+x+1)) -(3x²+3x+3)/((x-1)(x²+x+1))
    =(3x²+8x+2x-2-3x²-3x-3)/((x-1)(x²+x+1))
    =(7x-5)/((x-1)(x²+x+1))

  2. (3x^2+8x)/(x^3-1)+2/(x^2+x+1)+3/(1-x)
    =(3x^2+8x)/(x^3-1)+2/(x^2+x+1)-3/(x-1)
    =(3x^2+8x)/[(x-1).(x^2+x+1)]+[2.(x-1)]/[(x^2+x+1).(x-1)]-[3.(x^2+x+1)]/[(x-1).(x^+x+1)]
    =(3x^2+8x+2x-2-3x^2-3x-3)/[(x-1)(x^2+x+1)]
    =(7x-5)/(x^3-1)

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

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