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 7: bài 2 tìm x a)3/5.x+1/2=1/7 b)1/4+|x-1|=3

Toán Lớp 7: bài 2 tìm x
a)3/5.x+1/2=1/7
b)1/4+|x-1|=3

Comments ( 2 )

  1. a)
    3/5. x + 1/2 = 1/7
    <=> 3/5. x = 1/7 – 1/2
    <=> 3/5. x = – 5/14
    <=> x = (- 5/14 ) : 3/5
    <=> x = – 25/42
      $Vậy$ x = – 25/42
    b)
    1/4 + | x – 1 | = 3
    <=> | x – 1 | = 3 – 1/4
    <=> | x – 1 | = 11/4
    <=> $\left[\begin{matrix} x-1=\dfrac{11}{4}\\ x-1=-\dfrac{11}{4}\end{matrix}\right.$
    <=> $\left[\begin{matrix} x=\dfrac{15}{4}\\ x=-\dfrac{7}{4}\end{matrix}\right.$
                        $Vậy$ x ∈ { 15/4 ; – 7/4 }
     

  2. Gửi bạn :>
    Trình bày như trong hình
    toan-lop-7-bai-2-tim-a-3-5-1-2-1-7-b-1-4-1-3

Leave a reply

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