Lời giải:
a.
$8\frac{2}{3}: x-10=-8$
$8\frac{2}{3}:x =10-8=2$
$x=8\frac{2}{3}:2 = \frac{13}{3}$
b.
$\frac{3}{25}=\frac{x-1}{125}$
$x-1=\frac{3}{25}\times 125=15$
$x=15+1=16$
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`a)8 2/3:x-10=-8`
`=>26/3:x=-8+10`
`=>26/3:x=2`
`=>x=26/3:2`
`=>x=26/3 . 1/2`
`=>x=13/3`
Vậy `x=13/3`
__
`b)3/25=(x-1)/125`
`=>3.125=25(x-1)`
`=>375=25x-25`
`=>25x-25=375`
`=>25x=375+25`
`=>25x=400`
`=>x=400:25`
`=>x=16`
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