x+8x = 4^5 : 4^3 + 2^2 . 5 4( 4 - x )^2 - 2. 5^2 = -46 187 - 4( 2x - 1 )^3 = 79 2. 3^2x + 3 - 1 = 485

1 câu trả lời

`x+8x=4^5 : 4^3 + 2^2 . 5`

`9x=4^2 + 4.5`

`9x=16+20`

`9x=36`

`x=36:9`

`x=4`

`4.(4-x)^2 - 2.5^2 = -46`

`4.(4-x)^2 - 2.25=-46`

`4.(4-x)^2 - 50=-46`

`4.(4-x)^2 = 4`

`(4-x)^2 = 1`

`(4-x)^2 = 1^2`

`4-x=1`

`x=3`

`187-4.(2x-1)^3 = 79`

`4.(2x-1)^3 = 108`

`(2x-1)^3 = 108:4`

`(2x-1)^3 = 27`

`(2x-1)^3 = 3^3`

`2x-1=3`

`2x=4`

`x=2`

`2.3^2 x +3-1=485`

`2.9.x+2=485`

`18x=483`

`x=483:18`

`x=26,83`