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: (x-y)(x+y)=x^2-y^2 (x-y)^2=x^2- 2xy + y^2

Toán Lớp 8: (x-y)(x+y)=x^2-y^2
(x-y)^2=x^2- 2xy + y^2

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    (x – y)(x + y) = x^2 – y^2
    = x^2 + xy -yx – y^2
    = x^2 – y^2  (đpcm)
    ______________________________
    (x – y)^2 = x^2 – 2xy + y^2
    = (x – y)(x – y)
    = x^2 – xy – xy + y^2
    = x^2 – 2xy + y^2 (đpcm)

Leave a reply

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