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

Toán Lớp 8: Q = $\dfrac{1}{2x – 2}$ + $\dfrac{1}{2x + 2}$ + $\dfrac{x²}{1 – x²}$ =>Rút gọn Q

Home/ Toán Lớp 8: Q = $\dfrac{1}{2x – 2}$ + $\dfrac{1}{2x + 2}$ + $\dfrac{x²}{1 – x²}$ =>Rút gọn Q

Toán Lớp 8: Q = $\dfrac{1}{2x – 2}$ + $\dfrac{1}{2x + 2}$ + $\dfrac{x²}{1 – x²}$ =>Rút gọn Q

Tháng Năm 18, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Q = $\dfrac{1}{2x – 2}$ + $\dfrac{1}{2x + 2}$ + $\dfrac{x²}{1 – x²}$
=>Rút gọn Q

Comments ( 2 )

  1. tuyen98
    tuyen98
    18 Tháng Năm, 2022 at 3:10 sáng
    Reply

    Đáp án
    toan-lop-8-q-dfrac-1-2-2-dfrac-1-2-2-dfrac-1-rut-gon-q

    baoquyen
    baoquyen
    18 Tháng Năm, 2022 at 3:10 sáng
    Reply
    $Q=\dfrac{1}{2x-2}+\dfrac{1}{2x+2}+\dfrac{x^2}{1-x^2}$
    $=\dfrac{x+1}{2\left(x-1\right)\left(x+1\right)}+\dfrac{x-1}{2\left(x-1\right)\left(x+1\right)}+\dfrac{-2x^2}{2\left(x-1\right)\left(x+1\right)}$
    $=\dfrac{x+1+x-1-2x^2}{2\left(x-1\right)\left(x+1\right)}$
    $=\dfrac{-2x^2+2x}{2\left(x-1\right)\left(x+1\right)}$
    $=-\dfrac{x}{x+1}$

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

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