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: c/ x3 – 2×2 – 4xy2 + x d/ (x + 2)(x+3)(x+4)(x+5) – 8

Home/ Toán Lớp 8: c/ x3 – 2×2 – 4xy2 + x d/ (x + 2)(x+3)(x+4)(x+5) – 8

Toán Lớp 8: c/ x3 – 2×2 – 4xy2 + x d/ (x + 2)(x+3)(x+4)(x+5) – 8

Tháng Chín 11, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: c/ x3 – 2×2 – 4xy2 + x
d/ (x + 2)(x+3)(x+4)(x+5) – 8

Comments ( 1 )

  1. cobexinhdep
    cobexinhdep
    11 Tháng Chín, 2022 at 6:26 chiều
    Reply
    c)x^3-2x^2-4xy^2+x
    =x(x^2-2x-4y^2+1)
    =x[-(4y^2+x^2-2x+1)]
    =x[-(2y)^2-(x-1)^2]
    =-x(2y+x-1)(2y-x+1)
    d)(x+2)(x+3)(x+4)(x+5)-8
    =[(x+2)(x+5)][(x+3)(x+4)]-8
    =(x^2+2x+5x+10)(x^2+3x+4x+12)-8
    =(x^2+7x+10)(x^2+7x+12)-8
    =[(x^2+7x+11)-1][(x^2+7x+11)+1]-8
    =(x^2+7x+11)^2-1^2-8
    =(x^2+7x+11)^2-9
    =(x^2+7x+11+3)(x^2+7x+11-3)
    =(x^2+7x+14)(x^2+7x+8)
     

Leave a reply

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

Mỹ Thuận

About Mỹ Thuận