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: tính + rút gọn (5x + 3)(2 – x)+ (x – 1)² + 4x² – 5x

Toán Lớp 8: tính + rút gọn
(5x + 3)(2 – x)+ (x – 1)² + 4x² – 5x

Comments ( 2 )

  1. (5x+3)(2-x)+(x-1)^2+4x^2-5x
    =10x+6-5x^2-3x+x^2-2x+1+4x^2-5x
    =(-5x^2+4x^2+x^2)+(10x-3x-2x-5x)+(6+1)
    =7
    _______________________________________________
    #Wuang
     

  2. (5x+3).(2-x)+(x-1)^2+4x^2-5x
    =5x.2-5x.x+3.2-3.x+x^2-2x+1+4x^2-5x
    =10x-5x^2+6-3x+x^2-2x+1+4x^2-5x
    =(4x^2+x^2-5x^2)+(10x-5x-3x-2x)+(6+1)
    =0+0+7
    =7

Leave a reply

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

About Thúy Mai