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

Toán Lớp 7: a) 7x. (2x – 3) = 0 b) 1/3.x + 2/5 (x +1) = 0

Toán Lớp 7: a) 7x. (2x – 3) = 0
b) 1/3.x + 2/5 (x +1) = 0

Comments ( 2 )

  1. a)
    7x(2x-3) =0
    => \(\left[ \begin{array}{l}7x =0 \\2x -3 =0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=0\\x=\dfrac{3}{2}\end{array} \right.\) 
    Vậy x \in { 0 ; 3/2}
    b)
    1/3x +2/5(x+1) =0
    => 1/3x+ 2/5x +2/5 =0
    => 11/15x = -2/5
    => x = -2/5 : 11/15
    => x = -2/5 . 15/11
    => x = -6/11
    Vậy x = -6/11
     

  2. Các bước giải chi tiết :????
    toan-lop-7-a-7-2-3-0-b-1-3-2-5-1-0

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