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