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: Bài 1:Làm tính nhân a)3x(5x²-2x-1) b)(x²+2xy-3)(-xy) c)1/2x²y(2x³-2/3xy²-1)

Tháng Tám 26, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Bài 1:Làm tính nhân
a)3x(5x²-2x-1)
b)(x²+2xy-3)(-xy)
c)1/2x²y(2x³-2/3xy²-1)

Comments ( 2 )

  1. haianhtu97
    haianhtu97
    26 Tháng Tám, 2022 at 8:52 sáng
    Reply
    a) 3x.(5x² – 2x – 1)
    = 3x.5x² – 3x.2x – 3x.1
    = 15x³ – 6x² – 3x
    b)  (x² + 2xy – 3)(-xy)
    = x².(-xy) + 2xy.(-xy) – 3.(-xy)
    = -x³y – 2x²y² + 3xy
    c) $\frac{1}{2}$x²y.$\frac{2x³ – 2}{3xy² – 1}$
    = $\frac{x²y(2x³ – 2)}{2.(3xy² – 1}$
    = $\frac{2x^{5}y – 2x²y}{6xy³ – 2}$  
     

  2. minhtuyethue
    minhtuyethue
    26 Tháng Tám, 2022 at 8:52 sáng
    Reply
    #tnvt
    a)3x(5x^2-2x-1)
    =15x^3-6x^2-3x
    b)(x^2+2xy-3)(-xy)
    =-x^3y-2x^2y^2+3xy
    c)1/2x^2y(2x^3-2/3xy^2-1)
    =x^5y-1/3x^3y^3-1/2x^2y
     

Leave a reply

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

Madelyn

About Madelyn