[4,5 +3/4.x ] : 8/3 = 9/8 [ x- 2/7] .5/6 = -2/3 [3.x -1/2 ] . [ -1/4 -x ] =0 [x-1/4].3/28+2 7/9=8 7/8 3 1/3.x+16 3/4:8/3=9/8 |x-2/7|=5/8

0 bình luận về “[4,5 +3/4.x ] : 8/3 = 9/8 [ x- 2/7] .5/6 = -2/3 [3.x -1/2 ] . [ -1/4 -x ] =0 [x-1/4].3/28+2 7/9=8 7/8 3 1/3.x+16 3/4:8/3=9/8 |x-2/7|=5/8”

1. Đáp án + Giải thích các bước giải:

   +)

   `(4,5+3/4x):8/3=9/8`

   `to 4,5+3/4x=9/8 . 8/3`

   `to 4,5+3/4x=3`

   `to 3/4x=3-4,5`

   `to 3/4x=-1,5`

   `to x=-1,5:3/4`

   `to x=-2`

   +)

   `(x-2/7).5/6=-2/3`

   `to x-2/7=-2/3 : 5/6`

   `to x-2/7=-4/5`

   `to x=-4/5+2/7`

   `to x=-18/35`

   +)

   `(3x-1/2).(-1/4-x)=0`

   `to` \(\left[ \begin{array}{l}3x-\dfrac{1}{2}=0\\-\dfrac{1}{4}-x=0\end{array} \right.\) `to` \(\left[ \begin{array}{l}x=\dfrac{1}{6}\\x=-\dfrac{1}{4}\end{array} \right.\) 

   +)

   `(x-1/4).3/28+2 7/9=8 7/8`

   `to (x-1/4).3/28=8 7/8-2 7/9`

   `to (x-1/4).3/28=439/72`

   `to x-1/4=439/72 : 3/28`

   `to x-1/4=3073/54`

   `to x=3073/54+1/4`

   `to x=6173/10`

   +)

   `3 1/3x+16 3/4 : 8/3=9/8`

   `to 10/3x+201/32=9/8`

   `to 10/3x=9/8-201/32`

   `to 10/3x=-165/32`

   `to x=-165/32 : 10/3`

   `to x=-99/64`

   +)

   `|x-2/7|=5/8`

   `to` \(\left[ \begin{array}{l}x-\dfrac{2}{7}=\dfrac{5}{8}\\x-\dfrac{2}{7}=-\dfrac{5}{8}\end{array} \right.\) `to` \(\left[ \begin{array}{l}x=\dfrac{51}{56}\\x=-\dfrac{19}{56}\end{array} \right.\) 

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