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(x-3)(5x-4) b(2x-1)^2 cx^3-5x^2+6x:(-2x)

Toán Lớp 8: a(x-3)(5x-4)
b(2x-1)^2
cx^3-5x^2+6x:(-2x)

Comments ( 2 )

  1. a) (x – 3)(5x – 4)
    = 5x^{2} – 4x – 15x + 12
    = 5x^{2} – 19x + 12
    b) (2x – 1)^{2}
    = 4x^{2} – 4x + 1
    c) (x^{3} – 5x^{2} + 6x) : (-2x)
    = -1/2x^{2} + 5/2x – 3
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    a) (x-3)(5x-4)
    =x(5x-4)-3(5x-4)
    =5x^2-4x-15x+12
    =5x^2-(4x+15x)+12
    =5x^2-19x-12
    b) (2x-1)^2
    =(2x)^2-2.2x.1+1^2
    =4x^2-4x+1
    c) (x^3-5x^2+6x) : (-2x)
    =x^3 : (-2x) – 5x^2 : (-2x) + 6x : (-2x)
    =-1/2x^2+5/2x-3 
    Nếu đề là:
    x^3-5x^2+6x: (-2x)
    =x^3-5x^2-3

Leave a reply

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