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: Tìm x: c, x(5+3x) – (x+1)(3x-2)=6 d, (2x+ $\frac{1}{2}$)² – (1-2x)²=2

Tháng Sáu 14, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Tìm x:
c, x(5+3x) – (x+1)(3x-2)=6
d, (2x+ $\frac{1}{2}$)² – (1-2x)²=2

Comments ( 1 )

  1. buithaianh98
    buithaianh98
    14 Tháng Sáu, 2022 at 7:18 chiều
    Reply
    c) x(5+3x) – (x+1)(3x-2) =6
    <=> 5x + 3x^2 – (3x^2 – 2x + 3x-2)=6
    <=> 5x+ 3x^2 – 3x^2 + 2x – 3x +2=6
    <=> (5x + 2x-3x) + (3x^2 – 3x^2) +2=6
    <=> 4x + 2=6
    <=> 4x = 4
    <=> x=1
    Vậy x=1
    d) (2x+1/2)^2 – (1-2x)^2 =2
    <=> (2x+1/2 – 1+2x)(2x+1/2 + 1 -2x)=2
    <=> (4x-1/2) . 3/2 =2
    <=> 4x – 1/2 = 2 : 3/2
    <=> 4x – 1/2=4/3
    <=> 4x= 4/3 + 1/2
    <=> 4x= 11/6
    <=> x= 11/24
    Vậy x= 11/24
     

Leave a reply

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

Ngọc Sa

About Ngọc Sa