1) ` ( 3 1/2 + 2x) . 2 2/3 = 5 1/3`
`(7/2 + 2x) . 8/3 = 16/3`
`7/2 . 8/3 + 2x . 8/3 = 16/3`
`28/3 + 16/3 x = 16/3`
`16/3 x = 16/3 - 28/3`
`16/3 x= -4`
`x= -4 : 16/3`
`x= -4. 3/16`
`x= -3/4`
Vậy `x= -3/4`
2) `| 2x + 3| =5`
+) `2x + 3=5`
`=> 2x= 5-3`
`=> 2x= 2`
`=> x= 2:2`
`=>x=1`
+) `2x+ 3= -5`
`=> 2x = -5 -3`
`=> 2x= -8`
`=> x= -8 :2`
`=> x= -4`
Vậy `x =1` hoặc `x= -4`