Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

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

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

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     $\dfrac{x}{2x+2}+\dfrac{x}{3x-3}+\dfrac{-x}{1-x^{2}}$
    $=\dfrac{x}{2(x+1)}+\dfrac{x}{3(x-1)}+\dfrac{-x}{(1-x)(x+1)}$
    $=\dfrac{x}{2(x+1)}+\dfrac{x}{3(x-1)}+\dfrac{x}{(x-1)(x+1)}$
    $=\dfrac{x.3(x-1)}{6(x+1)(x-1)}+\dfrac{x.2(x+1)}{6(x-1)(x+1)}+\dfrac{6x}{6(x-1)(x+1)}$
    $=\dfrac{3x^{2}-3x+2x^{2}+2x+6x}{6(x-1)(x+1)}$
    $=\dfrac{5x^{2}+5x}{6(x-1)(x+1)}$
    $=\dfrac{5x(x+1)}{6(x-1)(x+1)}$
    $=\dfrac{5x}{6(x-1)}$
    (Bài tham khảo)

Leave a reply

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

About Lan Anh