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`
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