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: tìm x,y biết |3x – 3/4| = 5 : 2/3

Toán Lớp 7: tìm x,y biết |3x – 3/4| = 5 : 2/3

Comments ( 2 )

  1. Giải đáp:
      | 3x – 3/4| =5 : 2/3
    | 3x – 3/4| = 15/2
    ⇒\(\left[ \begin{array}{l}3x -\frac{3}{4} = \frac{15}{2}\\3x -\frac{3}{4} = -\frac{15}{2}\end{array} \right.\) 
    ⇒\(\left[ \begin{array}{l}3x  = \frac{33}{4}\\3x  = -\frac{27}{4}\end{array} \right.\) 
    ⇒\(\left[ \begin{array}{l}x  = \frac{11}{4}\\x  = -\frac{9}{4}\end{array} \right.\) 
    Vậy x \in {11/4 ; -9/4}

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-7-tim-y-biet-3-3-4-5-2-3

Leave a reply

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

About Thanh Tú