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 gọn biểu thức M=(x+3)(x-3)-(2x-3)(x+1)

Toán Lớp 8: Rút gọn biểu thức M=(x+3)(x-3)-(2x-3)(x+1)

Comments ( 2 )

  1. M = (x+3) (x-3) – (2x-3) (x+1)
    = x^2 – 9 – (2x^2+2x-3x-3)
    = x^2 – 9 – 2x^2 – 2x + 3x + 3
    = -x^2 + x – 6
     

  2. M= (x+3)(x-3) – (2x-3)(x+1)
    =x^2 – 3^2 -(2x^2 + 2x -3x -3)
    =x^2 -9 – 2x^2 -2x +3x +3
    = (x^2 – 2x^2 ) + (-9+3) +(-2x +3x)
    = -x^2 +x – 6
     

Leave a reply

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