c) 2 phần 3 - 1 phần 3 x = -5 phần 3 + 1 phần 2
\(\dfrac{2}{3}-\dfrac{1}{3}x=\dfrac{-7}{6}\)
\(\dfrac{1}{3}x=\dfrac{2}{3}-\dfrac{-7}{6}\)
\(\dfrac{1}{3}x=\dfrac{11}{6}\)
\(x=\dfrac{11}{6}:\dfrac{1}{3}\)
\(x=\dfrac{11}{2}\)
d) \(\dfrac{x-3}{5}=\dfrac{-7}{10}\)
đề là vầy hả bạn?
Đề câu `c` k rõ lắm 🤧
\(\dfrac{2}{3}-\dfrac{1}{3x}=\dfrac{-5}{3}+\dfrac{1}{2}\\ \dfrac{2}{3}-\dfrac{1}{3x}=-\dfrac{7}{6}\\ \dfrac{1}{3x}=\dfrac{2}{3}-\left(-\dfrac{7}{6}\right)\\ \dfrac{1}{3x}=\dfrac{11}{6}\)
`=>1xx6=11xx3xx``x`
`6=33xx``x`
`x=5,5`
Vậy `x=5,5`
_________________________
`d)`
\(\dfrac{x-3}{5}=\dfrac{-7}{10}\)
`=>(x-3)xx10=5xx(-7)`
`(x-3)xx10=-35`
`x-3=-3,5`
`x=-6,5`
Vậy `x=-6,5`
`@An`
Hơn nữa câu này mìn lm ròi mà 🤧
d) \(x-\dfrac{3}{5}=\dfrac{-7}{10}\)
\(x=\dfrac{-7}{10}+\dfrac{3}{5}\)
\(x=\dfrac{-1}{10}\)