`a)x-3/5=-7/10`
`=>x=-7/10+3/5=-1/10`
Vậy `x=-1/10`
`b)x:19/13=13/5`
`=>x=13/5*19/13`
`=>x=19/5`
Vậy `x=19/5`
`c)2/9-7/8*x=1/3`
`=>7/8*x=2/9-1/3=-1/9`
`=>x=-1/9:7/8=-8/63`
Vậy `x=-8/64`
`d)2/3x-3/2(x-1/2)=5/12`
`=>2/3x-3/2x+3/4=5/12`
`=>-5/6x=5/12-3/4=-7/12`
`=>x=7/10`
Vậy `x=7/10`
`a)x-3/5=-7/10`
`=>x=-7/10+3/5=-1/10`
Vậy `x=-1/10`
`b)x:19/13=13/5`
`=>x=13/5*19/13`
`=>x=19/5`
Vậy `x=19/5`
`c)2/9-7/8*x=1/3`
`=>7/8*x=2/9-1/3=-1/9`
`=>x=-1/9:7/8=-8/63`
Vậy `x=-8/64`
`d)2/3x-3/2(x-1/2)=5/12`
`=>2/3x-3/2x+3/4=5/12`
`=>-5/6x=5/12-3/4=-7/12`
`=>x=7/10`
Vậy `x=7/10`
Giải:
a) \(x-\dfrac{3}{5}=\dfrac{-7}{10}\)
\(x=\dfrac{-7}{10}+\dfrac{3}{5}\)
\(x=\dfrac{-1}{10}\)
b) \(x:\dfrac{19}{13}=\dfrac{13}{5}\)
\(x=\dfrac{13}{5}.\dfrac{19}{13}\)
\(x=\dfrac{19}{5}\)
c) \(\dfrac{2}{9}-\dfrac{7}{8}.x=\dfrac{1}{3}\)
\(\dfrac{7}{8}.x=\dfrac{2}{9}-\dfrac{1}{3}\)
\(\dfrac{7}{8}.x=\dfrac{-1}{9}\)
\(x=\dfrac{-1}{9}:\dfrac{7}{8}\)
\(x=\dfrac{-8}{63}\)
d) \(\dfrac{2}{3}x-\dfrac{3}{2}\left(x-\dfrac{1}{2}\right)=\dfrac{5}{12}\)
\(\dfrac{2}{3}x-\dfrac{3}{2}x+\dfrac{3}{4}=\dfrac{5}{12}\)
\(x.\left(\dfrac{2}{3}-\dfrac{3}{2}\right)=\dfrac{5}{12}-\dfrac{3}{4}\)
\(x.\dfrac{-5}{6}=\dfrac{-1}{3}\)
\(x=\dfrac{-1}{3}:\dfrac{-5}{6}\)
\(x=\dfrac{2}{5}\)
Chúc bạn học tốt!
