Giải thích các bước giải:
`b)`
`64 : (18 + 2x) = 2`
`=> 18 + 2x = 32`
`=> 2x = 14`
`=> x = 7`
`Vậy x = 7`
`c)`
`(37 + 18 : x) . 3 = 117`
`=> 37 + 18 : x = 39`
`=> 18 : x = 2`
`=> x = 9`
`Vậy x = 9`
`d)`
`2 . (19 + x : 4) + 15 = 55`
`=> 2 . (19 + x : 4) = 40`
`=> 19 + x : 4 = 20`
`=> x : 4 = 1`
`=> x = 4`
`Vậy x = 4`
`e)`
`(47 - x : 3) . 2 + 19 = 109`
`=> (47 - x : 3) . 2 = 90`
`=> 47 - x : 3 = 45`
`=> x : 3 = 2`
`=> x = 6`
`Vậy x = 6`
`g)`
`2 . (17 - x : 4) = 26`
`=> 17 - x : 4 = 13`
`=> x : 4 = 4`
`=> x = 16`
`Vậy x = 16`
`h)`
`32 : (x . 2 - 8) = 2`
`=> x . 2 - 8 = 16`
`=> x . 2 = 24`
`=> x = 12`
`Vậy x = 12`
`i)`
`17 . (x : 3 + 4) = 85`
`=> x : 3 + 4 = 5`
`=> x : 3 = 1`
`=> x = 3`
`Vậy x = 3`
