Question

[Quỳnh Phượng]

Tìm x biết(hình ảnh)

Answer 1

[Yen Nhi]

Answer:

a. \(\frac{2}{5}+\frac{3}{4}:x=\frac{-1}{2}\)

`=>3/4:x=-1/2-2/5`

`=>3/4:x=\frac{-9}{10}`

`=>x=3/4:(\frac{-9}{10}`

`=>x=-5/6`

b. `5/7-2/3.x=4/5`

`=>2/3.x=5/7-4/5`

`=>2/3.x=\frac{-3}{35}`

`=>x=(\frac{-3}{35}):2/3`

`=>x=\frac{-9}{70}`

c. `1/2x+3/5x=-2/3`

`=>(1/2+3/5)x=-2/3`

`=>\frac{11}{10}x=-2/3`

`=>x=(-2/3):\frac{11}{10}`

`=>x=\frac{-20}{33}`

d. `4/7x-x=\frac{-9}{14}`

`=>(4/7-1)x=\frac{-9}{14}`

`=>-3/7x=\frac{-9}{14}`

`x=\frac{-9}{14}:(-3/7)`

`=>x=3/2`