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: rút gon các biểu thức sau: a ) (x – 2) ² + (x + 3) ² -2x (x – 5) b ) (2x – 1) ² – (3 – 2x) ² – (x + 5) (7 – 3x)

Toán Lớp 8: rút gon các biểu thức sau:
a ) (x – 2) ² + (x + 3) ² -2x (x – 5)
b ) (2x – 1) ² – (3 – 2x) ² – (x + 5) (7 – 3x)

Comments ( 2 )

  1. Chúc em một ngày vui vẻ
    #senku senpai
    toan-lop-8-rut-gon-cac-bieu-thuc-sau-a-2-3-2-5-b-2-1-3-2-5-7-3

  2. a)
    (x-2)^2+(x+3)^2-2x(x-5)
    =x^2-4x+4+x^2+6x+9-2x^2+10x
    =(x^2+x^2-2x^2)+(-4x+6x+10x)+(4+9)
    =12x+13
    b)
    (2x-1)^2-(3-2x)^2-(x+5)(7-3x)
    =(4x^2-4x+1)-(4x^2-12x+9)-(-3x^2-8x+35)
    =4x^2-4x+1-4x^2+12x-9+3x^2+8x-35
    =(4x^2-4x^2+3x^2)+(-4x+12x+8x)+(1-9-35)
    =3x^2+16x-43
     

Leave a reply

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

About Nguyệt