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: a)(3x^2-4x-7):(x+1) b)(2x+3)(x-5)-2(x+1)(x-1)

Toán Lớp 8: a)(3x^2-4x-7):(x+1)
b)(2x+3)(x-5)-2(x+1)(x-1)

Comments ( 2 )

  1. $\\$
    Giải đáp + giải thích các bước giải :
    a,
    3x^2  -4x-7
    = 3x^2 – 7x + 3x – 7
    = (3x^2 – 7x)+(3x-7)
    = x (3x – 7)+(3x-7)
    = (3x-7)(x+1)
    (3x^2  -4x-7):(x+1)
    = (3x-7)(x+1):(x+1)
    = 3x-7
    b,
    (2x+3)(x-5)-2(x+1)(x-1)
    = (2x^2 – 10x +3x-15)-2(x^2-1)
    = 2x^2 – 7x – 15 – 2x^2+2
    = -7x – 13

Leave a reply

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

About Thu Ánh