Đáp án:
`b`,`
`1/3x - 9/4 = 1/2`
`-> 1/3x = 1/2 + 9/4`
`-> 1/3x=11/4`
`->x=11/4 ÷ 1/3`
`->x=33/4`
Vậy `x=33/4`
$\\$
`c,`
`3x-1/4 = 2x + 2/3`
`-> 3x-2x=1/4 + 2/3`
`-> (3-2)x = 11/12`
`-> x=11/12`
Vậy `x=11/12`
$\\$
`d,`
`5 (x-1/4) = 3 (1/4 - x)`
`-> 5x - 5/4 = 3/4 - 3x`
`-> 5x + 3x = 3/4 + 5/4`
`-> (5+3)x=2`
`-> 8x=2`
`->x=2÷8`
`-> x=1/4`
Vậy `x=1/4`
$\\$
`e,`
`x-3/5 = 9/8-x`
`-> x + x = 9/8 + 3/5`
`-> (1+1)x=69/40`
`->2x=69/40`
`->x=69/40÷2`
`->x=69/80`
Vậy `x=69/80`
$\\$
`f,`
`|x| - 1/12 = 9/27`
`-> |x| = 9/27 + 1/12`
`-> |x| = 5/12`
`->` \(\left[ \begin{array}{l}x=\dfrac{5}{12}\\x=\dfrac{-5}{12}\end{array} \right.\)
Vậy `x=5/12` hoặc `x=(-5)/12`
$\\$
`g,`
`|x| + 4/9 = 3/2 + (-1)/8`
`-> |x| + 4/9 = 11/8`
`-> |x| = 11/8 - 4/9`
`-> |x| = 67/72`
`->` \(\left[ \begin{array}{l}x=\dfrac{67}{72}\\x=\dfrac{-67}{72}\end{array} \right.\)
Vậy `x=67/72` hoặc `x=(-67)/72`
