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: 1/ 2x^2(3x – 5) 2/ (x – 3)(6 – 6x^2) 3/ 2x^2(3x – 5) + (x – 3)(6 – 6x^2) 4/ (3x + 5)^2 5/ (2x – 3)^2 6/ (3x + 5)^2 – (2x – 3)^2 7/ (x

Tháng Tám 5, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1/ 2x^2(3x – 5)
2/ (x – 3)(6 – 6x^2)
3/ 2x^2(3x – 5) + (x – 3)(6 – 6x^2)
4/ (3x + 5)^2
5/ (2x – 3)^2
6/ (3x + 5)^2 – (2x – 3)^2
7/ (x – 3)^3
8/ (x -3)(x +3)
9/ (x + 2)^3
10/ (x – 3)^3 + (x -3)(x +3) + (x + 2)^3

Comments ( 1 )

  1. hauthanhyen98
    hauthanhyen98
    5 Tháng Tám, 2022 at 2:52 sáng
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
    1) 2x^2(3x – 5)
    = 6x^3 – 10x^2
    2) (x – 3)(6 – 6x^2)
    = 6x – 6x^3 – 18 + 18x^2
    3) 2x^2(3x – 5) + (x – 3)(6 – 6x^2)
    = 6x^3 – 10x^2 – 6x^3 + 18x^2 + 6x – 18
    = 8x^2 + 6x – 18
    4) (3x + 5)^2
    = (3x)^2 + 2.3x.5 + 5^2
    = 9x^2 + 30x + 25
    5) (2x – 3)^2
    = (2x)^2 – 2.2x.3 + 3^2
    = 4x^2 – 12x + 9
    6) (3x + 5)^2 – (2x – 3)^2
    = 9x^2 + 30x + 25 – 4x^2 + 12x – 9
    = 5x^2 + 42x + 16
    7) (x – 3)^3
    = x^3 – 3.x^2 . 3 + 3.x.3^2 – 3^3
    = x^3 – 3x^2 + 27x – 27
    8) ( x -3)(x + 3)
    = x^2 – 3^2 = x^2 -9
    9) (x + 2)^3
    = x^3 + 3.x^2 . 2 + 3.x.2^2 + 2^3
    = x^3 + 6x^2 + 12x + 8
    10) (x – 3)^3 + (x -3)(x +3) + (x + 2)^3
    = x^3 – 3x^2 + 27x – 27 + x^2 -9 + x^3 + 6x^2 + 12x + 8
    = 2x^3 + 4x^2 + 39x – 28

Leave a reply

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

Hoa

About Hoa