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 9: Rút gọn A A = 2/√x – 1 + 2/√x +1 + √x – 5/x -1

Toán Lớp 9: Rút gọn A
A = 2/√x – 1 + 2/√x +1 + √x – 5/x -1

Comments ( 1 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    A=2/(\sqrtx-1)+2/(\sqrtx+1)+(\sqrtx-5)/(x-1)(x\ge0;x\ne1)
    =>A=(2(\sqrtx+1))/((\sqrtx-1)(\sqrtx+1))+(2(\sqrtx-1))/((\sqrtx+1)(\sqrtx-1))+(\sqrtx-5)/(x-1)
    =>A=(2\sqrtx+2)/(x-1)+(2\sqrtx-2)/(x-1)+(\sqrtx-5)/(x-1)
    =>A=(2\sqrtx+2+2\sqrtx-2+\sqrtx-5)/(x-1)
    =>A=(5\sqrtx-5)/(x-1)
    =>A=(5(\sqrtx-1))/((\sqrtx-1)(\sqrtx+1))
    =>A=5/(\sqrtx+1)
     

Leave a reply

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