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

Toán Lớp 8: Thực hiện phép tính : 1/x^2+6x+9 + 1/6x-x^2-9 + x/x^2-9

Tháng Tư 23, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: Thực hiện phép tính : 1/x^2+6x+9 + 1/6x-x^2-9 + x/x^2-9

Comments ( 2 )

  1. thanhthuythu
    thanhthuythu
    23 Tháng Tư, 2023 at 3:08 sáng
    Reply

    Mong cho lời giải hay nhất ❤️⭐️
    toan-lop-8-thuc-hien-phep-tinh-1-2-6-9-1-6-2-9-2-9

  2. dongoclandiem
    dongoclandiem
    23 Tháng Tư, 2023 at 3:07 sáng
    Reply
    $\frac{1}{x^2+6x+9}+\frac{1}{6x-x^2-9}+\frac{x}{x^2-9}$
    $=\frac{\left(x-3\right)^2}{\left(x+3\right)^2\left(x-3\right)^2}+\frac{-x^2-6x-9}{\left(x+3\right)^2\left(x-3\right)^2}+\frac{x\left(x+3\right)\left(x-3\right)}{\left(x+3\right)^2\left(x-3\right)^2}$
    $=\frac{\left(x-3\right)^2-x^2-6x-9+x\left(x+3\right)\left(x-3\right)}{\left(x+3\right)^2\left(x-3\right)^2}$
    $=\frac{x^3+3^2-12x-3^2x-9}{\left(x+3\right)^2\left(x-3\right)^2}$
    $=\frac{x^3-21x}{\left(x+3\right)^2\left(x-3\right)^2}$
     

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

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