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: tìm x biết: a, x^2 –x – 2 b, 2x^2 – 5x + 3 c, x^2- 4x +3

Toán Lớp 8: tìm x biết:
a, x^2 –x – 2
b, 2x^2 – 5x + 3
c, x^2- 4x +3

Comments ( 2 )

  1. Giải đáp:
    a, x^2 –x – 2=x^2-2x+x-2=x(x-2)+(x-2)=(x-2)(x+1)
    b 2x^2 – 5x + 3=2x^2-2x-3x+3=2x(x-1)-3(x-1)=(x-1)(2x-3)
    c, x^2- 4x +3=(x-2)^2-1=(x-2-1)(x-2+1)=(x-3)(x-1)

  2. Giải đáp+Lời giải và giải thích chi tiết:
    a,
    x^2 – x – 2
    =x^2-2x+x-2
    =x(x-2)+(x-2)
    =(x-2)(x+1)
    b,
    2x^2 – 5x + 3
    =2x^2-2x-3x+3
    =2x(x-1)-3(x-1)
    =(x-1)(2x-3)
    c,
    x^2-4x+3
    =(x-2)^2 -1
    =(x-2-1)(x-2+1)
    =(x-3)(x-1)

Leave a reply

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

About Tùy Linh