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 6: a)(3.x-1/3).(2.x+7/3)=0 b)(3.x+1)-25=75

Toán Lớp 6: a)(3.x-1/3).(2.x+7/3)=0
b)(3.x+1)-25=75

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a) (3x-1/3).(2x+7/3)=0
    <=>\(\left[ \begin{array}{l}3x-\dfrac{1}{3}=0\\2x+\dfrac{7}{3}=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}3x=\dfrac{1}{3}\\2x=-\dfrac{7}{3}\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=\dfrac{1}{9}\\x=-\dfrac{7}{6}\end{array} \right.\) 
       Vậy x∈{1/9; -7/6}
    b) (3x+1)-25=75
    <=> 3x+1=75+25
    <=> 3x+1 = 100
    <=> 3x = 100 -1
    <=> 3x = 99
    <=> x = 99:3
    <=> x = 33
       Vậy x=33

  2. a,
    (3x – 1/3) . (2x + 7/3) = 0
    => Xảy ra 2 trường hợp sau:
    +)  3x – 1/3 = 0
    => 3x = 1/3
    => x = 1/3 : 3
    => x = 1/9
    +)  2x + 7/3 = 0
    => 2x = (-7)/3
    => x = (-7)/3 : 2
    => x = (-7)/6
    Vậy x ∈ {1/9 ; (-7)/6}
    b,
    (3x + 1) – 25 = 75
    => 3x + 1 = 75 + 25
    => 3x + 1 = 100
    => 3x = 100 – 1
    => 3x = 99
    => x = 99 : 3
    => x = 33
    Vậy x = 33
     

Leave a reply

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