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: 1 , [x+y] . [x+y] 2, [x-y] . [x-y] 3, [x+y] . [x-y] 4,[x-y] . [x+y]

Home/ Toán Lớp 8: 1 , [x+y] . [x+y] 2, [x-y] . [x-y] 3, [x+y] . [x-y] 4,[x-y] . [x+y]

Toán Lớp 8: 1 , [x+y] . [x+y] 2, [x-y] . [x-y] 3, [x+y] . [x-y] 4,[x-y] . [x+y]

Tháng Chín 24, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 1 , [x+y] . [x+y]
2, [x-y] . [x-y]
3, [x+y] . [x-y]
4,[x-y] . [x+y]

Comments ( 2 )

  1. dongoctuan
    dongoctuan
    24 Tháng Chín, 2022 at 12:35 chiều
    Reply
    Giải đáp:
    $\begin{array}{l}1. \ (x+y)(x+y)=(x+y)^2=x^2+2xy+y^2\\2. \ (x-y)(x-y)=(x-y)^2=x^2-2xy+y^2\\3. \ (x+y)(x-y)=x^2-xy+xy-y^2=x^2-y^2\\4. \ (x-y)(x+y)=x^2+xy-xy-y^2=x^2-y^2\end{array}$

  2. behocgioitoan
    behocgioitoan
    24 Tháng Chín, 2022 at 12:35 chiều
    Reply
    [x+y].[x+y]=x.x+x.y+y.x+y.y=x^2+xy+yx+y^2=xy^2
    [x-y] . [x-y]=x.x-x.y+y.x-y.y=x^2-xy+yx-y^2

Leave a reply

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

Bảo Anh

About Bảo Anh