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: Phân tích đa thức sau thành nhân tử:4x²-1-x(2x-1)

Toán Lớp 8: Phân tích đa thức sau thành nhân tử:4x²-1-x(2x-1)

Comments ( 2 )

  1.    4x^2 – 1 – x( 2x – 1 )
    = (2x)^2 – 1^2 – x( 2x – 1 )
    = ( 2x – 1 )( 2x + 1 ) – x( 2x – 1 )
    = ( 2x – 1 )( 2x + 1 – x )
    = ( 2x – 1 )( x + 1 )
    Áp dụng : a^2 – b^2 = ( a + b )( a – b )
     

  2. 4x^2-1-x(2x-1)
    =(4x^2-1)-x(2x-1)
    =(2x-1)(2x+1)-x(2x-1)
    =(2x-1)(2x+1-x)
    =(2x-1)(x+1)

Leave a reply

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