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: Gấp! a, x^2 – 4x + 4 b, x^2 – 2 c, 1 – 8x^3

Toán Lớp 8: Gấp!
a, x^2 – 4x + 4
b, x^2 – 2
c, 1 – 8x^3

Comments ( 2 )

  1. Bài làm :
    a,
    x^2-4x+4
    =x^2-2.x.2+2^2
    =(x-2)^2
    b,
    x^2-2
    =x^2-(\sqrt{2})^2
    =(x-\sqrt{2})(x+\sqrt{2})
    c,
    1-8x^3
    =1^3-(2x)^3
    =(1-2x)[1^2+2x.1+(2x)^2]
    =(1-2x)(1+2x+4x^2)
     

  2. @kem
    a, x^2 – 4x + 4
    = x² – 2x.2 + 2²
    = (x-2)²
    b, x^2 – 2
    =x² – (\sqrt2)²
    = (x- \sqrt2 )(x + \sqrt2 )
    c, 1 – 8x^3
    = 1³ – ( 2x )³
    = (1- 2x) ( 1 + 2x + 4x²)

Leave a reply

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

About Phi Nhung