Giải thích các bước giải:
`a)`
`0,25.x-27/8-x=3/4`
`=>1/4 . x-27/8-x=3/4`
`=>1/4 .x-x-27/8=3/4`
`=>x.(1/4-1)-27/8=3/4`
`=>x.(1/4-4/4)=3/4+27/8`
`=>x.(-3)/4=6/8+27/8`
`=>x.(-3)/4=33/8`
`=>x=33/8:(-3)/4`
`=>x=33/8.(-4)/3`
`=>x=-11/2`
Vậy `x=-11/2`
`b)`
`7/8+4 1/2 :x=-13/40`
`=>7/8+9/2:x=-13/40`
`=>9/2:x=-13/40-7/8`
`=>9/2:x=-13/40-35/40`
`=>9/2:x=-48/40`
`=>9/2:x=-11/20`
`=>x=9/2:(-6)/5`
`=>x=9/2 . (-5)/6`
`=>x=-15/4`
Vậy `x=-15/4`
`c)`
`32%-0,25:x=-3 2/4`
`=>0,32-0,25:x=-3,5`
`=>0,25:x=0,32+3,5`
`=>0,25:x=3,82`
`=>x=0,25:3,82`
`=>x=25/382`
Vậy `x=25/382`
