`1, 3 1/2 - 2 : ( 5 3/4 x ) = 250%`
`⇔ 7/2 - 2 : ( 23/4 . x ) = 5/2`
`⇔ 2 : ( 23/4 . x ) = 7/2 - 5/2`
`⇔ 2 : ( 23/4 . x ) = 1`
`⇔ 23/4 . x = 2 : 1`
`⇔ 23/4 . x = 2`
`⇔ x = 2 : 23/4`
`⇔ x = 8/23`
Vậy , `x = 8/23`
`2, 135 - 5^x = | - 10 | . ( - 1^2010 )`
`⇔ 135 - 5^x = 10 . 1`
`⇔ 135 - 5^x = 10`
`⇔ 5^x = 135 - 10`
`⇔ 5^x = 125`
`⇔ 5^x = 5^3`
`⇔ x = 3`
Vậy , `x = 3`