`***`Lời giải`***`
a)
`3x:2,7=1/3:2 1/4`
`<=>3x:2,7=1/3:9/4`
`<=>3x:2,7=1/3. 4/9`
`<=>3x=4/27 .2,7`
`<=>3x=2/5`
`<=>x=2/5 . 1/3=2/15`
Vậy `x=2/15`
b)
`3:0,4x=1:0,01`
`<=>3:0,4x=100`
`<=>0,4x=3/100`
`<=>x=3/100:0,4`
`<=>x=3/40`
Vậy `x=3/40`
c)
`1,35:0,2=1,25:0,1x`
` <=>1,25:0,1x=27/4`
` <=>0,1x=1,25:27/4`
` <=>0,1x=5/27`
` <=>x=5/27 .10=50/27`
Vậy `x=50/27`
d)
`3 1/3:2,4=0,35x:0,35`
`<=>0,35x:0,35=10/3:2,4`
`<=>x=10/3:2,4`
`<=>x=25/18`
Vậy `x=25/18`