Question

[Lily :3]

Tìm x biết:
a, \(\left(4,5-2.x\right).1\dfrac{4}{7}=\dfrac{11}{14}\)
b, \(\left(2,8.x-32\right):\dfrac{2}{3}=-90\)
Cảm ơn ạ!

Answer 1

[Yeutoanhoc]

`a)(4,5-2x)*1 4/7=11/14`

`=>(4,5-2x)*11/7=11/14`

`=>4,5-2x=1/2`

`=>2x=4,5-0,5=4`

`=>x=2`

Vậy `x=2`

`b)(2,8x-32):2/3=-90`

`=>2,8x-32=-90*2/3=-60`

`=>2,8x=-28`

`=>x=-10`

Vậy `x=-10`