Đáp án+Giải thích các bước giải:
`a)`
`|x|=0`
`→x=0`
Vậy `x=0`
`b)`
`|3x-5|=0`
`→3x-5=0`
`→3x=5`
`→x=5/3`
`c)`
`|2x+1|-1/2=-3/7`
`→|2x+1|=-3/7+1/2`
`→|2x+1|=1/14`
TH 1:
`2x+1=1/14`
`→2x=1/14-1`
`→2x=-13/14`
`→x=-13/28`
TH 2:
`2x+1=-1/14`
`→2x=-1/14-1`
`→2x=-15/14`
`→x=-15/28`
Vậy `x∈\{-13/28;-15/28\}`
`d)`
`3.|4x-1|-2,5=19,5`
`→3.|4x-1|=22`
`→|4x-1|=22/3`
TH 1:
`4x-1=22/3`
`→4x=22/3+1`
`→4x=25/3`
`→x=25/12`
TH 2:
`4x-1=-22/3`
`→4x=-22/3+1`
`→4x=-19/3`
`→x=-19/12`
Vậy `x∈\{25/12;-19/12\}`
