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

Toán Lớp 7: 3/7-1/21X=1/3 7/6 – X : 3/4 = 1/12 ( X – 2/7 ). ( X + 3/4 ) = 0

Home/ Toán Lớp 7: 3/7-1/21X=1/3 7/6 – X : 3/4 = 1/12 ( X – 2/7 ). ( X + 3/4 ) = 0

Toán Lớp 7: 3/7-1/21X=1/3 7/6 – X : 3/4 = 1/12 ( X – 2/7 ). ( X + 3/4 ) = 0

Tháng Tám 9, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 3/7-1/21X=1/3
7/6 – X : 3/4 = 1/12
( X – 2/7 ). ( X + 3/4 ) = 0

Comments ( 2 )

  1. ankim
    ankim
    9 Tháng Tám, 2022 at 12:00 chiều
    Reply
    3/7-1/21.x=1/3
    1/21.x=3/7-1/3
    1/21.x=2/21
    x=2/21:1/21
    x=2/21
    —–
    7/6-x:3/4=1/12
    x:3/4=7/6-1/12
    x:3/4=13/12
    x=13/12.3/4
    x=39/48
    ——-
    (x-2/7).(x+3/4)=0
    <=>\(\left[ \begin{array}{l}x-2/7=0\\x+3/4=0\end{array} \right.\)
    <=>\(\left[ \begin{array}{l}x=2/7\\x=-3/4\end{array} \right.\) 
    Vậy x in {2/7;-3/4}

  2. dongoclandiem
    dongoclandiem
    9 Tháng Tám, 2022 at 11:59 sáng
    Reply
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
    3/7 – 1/21 . x = 1/3
    => 1/21 . x = 9/21 – 7/21
    => 1/21 . x = 2/21
    => x = 2/21 : 1/21
    => x = 2
    ____________
    7/6 – x : 3/4 = 1/12
    => x : 3/4 = 14/12 – 1/12
    => x : 3/4 = 13/12
    => x = 13/12 . 3/4
    => x = 13/16
    _________
    ( x – 2/7 ) . ( x + 3/4 ) = 0
    => x – 2/7 = 0 hoặc x + 3/4 = 0
    => x = 2/7 hoặc x = -3/4
          Vậy x in { 2/7; -3/4 } 

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

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