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

Toán Lớp 8: Tính D=(x/x-1 – 4x/x^2+x+1 – 2x+1/3x^3-1).(x + 2x+1/x-1)

Tháng Tư 28, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Tính
D=(x/x-1 – 4x/x^2+x+1 – 2x+1/3x^3-1).(x + 2x+1/x-1)

Comments ( 1 )

  1. quynhthanhnhu
    quynhthanhnhu
    28 Tháng Tư, 2022 at 5:13 chiều
    Reply
    D=(x/(x-1) – (4x)/(x^2+x+1) – (2x+1)/(x^3-1))*(x + (2x+1)/(x-1))
    D=(x(x^2+x+1)-4x(x-1)-(2x+1))/((x-1)(x^2+x+1))*(x^2-x+2x+1)/(x-1)
    D=(x^3-3x^2+3x-1)/((x-1)(x^2+x+1))*(x^2+x+1)/(x-1)
    D=x-1

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

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