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: (x=1)^2+(x-2).(x+3)-4x bài 2 a) 7x^2+14x b) 3.(x+4)-x^2-4x c) 6x^2-7x-3

Tháng Sáu 8, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: bài 1: (x=1)^2+(x-2).(x+3)-4x
bài 2
a) 7x^2+14x
b) 3.(x+4)-x^2-4x
c) 6x^2-7x-3

Comments ( 2 )

  1. tuenhioanh
    tuenhioanh
    8 Tháng Sáu, 2022 at 10:21 chiều
    Reply
    Bài 1:
    (x+1)^2+(x-2).(x+3)-4x
    =x^2+2x+1+(x-2)(x+3)-4x
    =2x^2+2x+1+x-6-4x
    =2x^2+3x-5-4x
    =2x^2-x-5
    Bài 2:
    a) 7x^2+14x
    =7(x^2+2x)
    =7x(x+2)
    b) 3(x+4)-x^2-4x
    =3x+12-x^2-4x
    =-x+12-x^2
    =(3-x)(x+4)
    c) 6x^2-7x-3
    =(6x^2-9x)+(2x-3)
    =3x(2x-3)+2x-3
    =(2x-3)(3x+1)

  2. huyenmi76
    huyenmi76
    8 Tháng Sáu, 2022 at 10:20 chiều
    Reply
    1.(x+1)²+(x-2).(x+3)-4x
    =(x²+2x+1+x²+3x-2x-6)-4x
    =2x²+3x-5-4x
    =2x²-x-5
    2.a)7x²+14x
    =7x(x+2)
    b)3(x+4)-x²-4x
    =3x+12-x²-4x
    =-x²-x+12
    =-x²+x-12
    =(x+4)(x-3)
     c)6x²-7x-3
    =6x²+2x-9x-3
    =2x(3x+1)-3(3x+1)
    =(3x+1)(2x-3)

Leave a reply

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

Lan Phương

About Lan Phương