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: Bài 1:Khai triển: b) (y²x _ 3 ab) ² c)(x²-67) (x² +67)

Toán Lớp 8: Bài 1:Khai triển:
b) (y²x _ 3 ab) ²
c)(x²-67) (x² +67)

Comments ( 2 )

  1. \(b)(y^2x-3ab)^2\)
    \(=(y^2x)^2-2.y^2x.3ab+(3ab)^2\)
    \(=y^4x^2-6abxy^2+9a^2b^2\)
    \(c)(x^2-67)(x^2+67)\)
    \(=(x^2)^2-67^2\)
    \(=x^4-4489\)

  2. (y^2x-3ab)^2
    =(y^2x)^2-2*y^2x*3ab+(3ab)^2
    =y^4x^2-6xy^2ab+9a^2b^2
    ………..
    (x^2-67)(x^2-67)
    =(x^2)^2-(67)^2
     =x^4-4489

Leave a reply

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