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: 7x(x – 4) – (7x + 3)(2x^2 – x + 4).

Toán Lớp 8: 7x(x – 4) – (7x + 3)(2x^2
– x + 4).

Comments ( 2 )

  1. 7x(x – 4) – (7x + 3)(2x^2 – x + 4).=7x^2-28x-(14x^3-7x^2+28x+6x^2-3x+12)
    =7x^2-28x-14x^3+7x^2-28x-6x^2+3x-12=14x^3+8x^2-53x-12

  2. Giải đáp:
    7x(x – 4) – (7x + 3)(2x^2 – x + 4)
    = 7x^2−28x−(14x^3−7x^2+28x+6x^2−3x+12)
    = 7x^2−28x−14x^3+7x^2−28x−6x^2+3x−12
    = -14x^3 + (7x^2 + 7x^2 – 6x^2) + (-28x – 28x + 3x) – 12
    = −14x^3+8x^2−53x−12
    ∘ dariana

Leave a reply

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