Đáp án + Giải thích các bước giải:
`a, -2,5 + |3x+5|=-1,5`
`<=> -2,5 + 3x + 5 =-1,5`
`<=> 3x = -4`
`<=> x=-4/3`
`b, 1/5 -|1/5 -x|=1/5`
`<=> 1/5 - x = 1/5 - 1/5`
`<=> 1/5 - x =0`
`<=> x = 1/5`
`c, -5/6 - |2-x|=1/3`
`<=>2-x = -5/6 - 1/3`
`<=> 2-x=-7/6`
`<=> x = 2-(-7/6)`
`<=> x = 19/6`
`d, |5-3x|+2/3 = 1/6`
`<=> 5-3x = -1/2`
`<=>3x = 11/2`
`<=> x=11/6`
`e, |x-2/5|-3/4=-1/2`
`<=> x-2/5 = 1/4`
`<=> x=13/20`
`f, (1,25 - 4/5 x )^3 = -125`
`<=> (5/4 - 4/5 x )^3 = (-5)^3`
`=> 5/4 - 4/5 x = -5`
`<=> 4/5x = 25/4`
`<=> x= 125/16`
