Lời giải:
a.
$\frac{-2}{3}+2x=\frac{4}{3}$
$2x=\frac{4}{3}-\frac{-2}{3}=2$
$x=2:2=1$
b.
$\frac{5}{8}-5:x=\frac{-3}{8}$
$5:x=\frac{5}{8}-\frac{-3}{8}=1$
$x=5:1=5$
c.
$\frac{2}{3}-x=\frac{-1}{2}$
$x=\frac{2}{3}-\frac{-1}{2}=\frac{7}{6}$
d.
$\frac{5}{7}-4x=\frac{-51}{7}$
$4x=\frac{5}{7}-\frac{-51}{7}=8$
$x=8:4=2$
a) \(-\dfrac{2}{3}+2x=\dfrac{4}{3}\)
\(\Rightarrow2x=\dfrac{4}{3}+\dfrac{2}{3}\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
b) \(\dfrac{5}{8}-5:x=-\dfrac{3}{8}\)
\(\Rightarrow5:x=\dfrac{5}{8}+\dfrac{3}{8}\)
\(\Rightarrow5:x=1\)
\(\Rightarrow x=5\)
c) \(\dfrac{2}{3}-x=-\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{2}{3}+\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{7}{6}\)
d) \(\dfrac{5}{7}-4x=-\dfrac{51}{7}\)
\(\Rightarrow4x=\dfrac{5}{7}+\dfrac{51}{7}\)
\(\Rightarrow4x=8\)
\(\Rightarrow x=2\)
`@` `\text {Ans}`
`\downarrow`
`a,`
`-2/3 + 2x = 4/3`
`=> 2x = 4/3 - (-2/3)`
`=> 2x = 2`
`=> x=2 \div 2`
`=> x=1`
Vậy, `x=1`
`b,`
`5/8 - 5 : x = -3/8`
`=> 5 \div x = 5/8 - (-3/8)`
`=> 5 \div x = 1`
`=> x= 5 \div 1`
`=> x=5`
Vậy, `x=5`
`c,`
`2/3 - x = -1/2`
`=> x=2/3 - (-1/2)`
`=> x=7/6`
Vậy, `x=7/6`
`d,`
`5/7 - 4x = -51/7`
`=> 4x = 5/7 - (-51/7)`
`=> 4x=8`
`=> x=8 \div 4`
`=> x=2`
Vậy, `x=2.`
`@` `\text {Kaizuu lv u}`