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: $\frac{x+3}{x^2-9}$ +$\frac{x-4}{x-3}$ -$\frac{6}{x+3}$

Toán Lớp 8: $\frac{x+3}{x^2-9}$ +$\frac{x-4}{x-3}$ -$\frac{6}{x+3}$

Comments ( 2 )

  1. $\\$
    (x+3)/(x^2-9) + (x-4)/(x-3)-6/(x+3)(x\ne 3, x\ne -3)
    =(x+3)/((x-3)(x+3))+((x-4)(x+3))/((x-3)(x+3)) – (6(x-3))/((x-3)(x+3))
    = (x+3 + x^2+3x-4x-12 – 6x + 18)/((x-3)(x+3))
    = (x^2 -6x +9)/((x-3)(x+3))
    =(x^2-2.x.3+3^2)/((x-3)(x+3))
    =(x-3)^2/((x-3)(x+3))
    =(x-3)/(x+3)
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
     (x+3)/(x^2-9)+(x-4)/(x-3)-6/(x+3) ĐK: x\ne+-3
    =(x+3)/((x-3)(x+3))+(x-4)/(x-3)-6/(x+3)
    =(x+3)/((x-3)(x+3))+((x-4)(x+3))/((x-3)(x+3))-(6(x-3))/((x-3)(x+3))
    =(x+3+(x-4)(x+3)-6(x-3))/((x-3)(x+3))
    =(x+3+x^2+3x-4x-12-6x+18)/((x-3)(x+3))
    =(x^2-6x+9)/((x-3)(x+3))
    =((x-3)^2)/((x-3)(x+3))
    =(x-3)/(x+3)

Leave a reply

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

About Khánh Ly