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`(4 + 2x) * (9 - 3x) = 0`
TH1: `4 + 2x = 0 => 2x = -4 => x = -2`
TH2: `9 - 3x = 0 => 3x = 9 => x = 3`
Vậy, `x \in {-2; 3}`
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`(3x - 19)^3 = 125`
`=> (3x - 19)^3 = 5^3`
`=> 3x - 19 = 5`
`=> 3x = 24`
`=> x = 8`
Vậy, `x = 8.`
\(\Leftrightarrow\left(3x-4\right)^3=5^3\\ \Leftrightarrow3x-4=5\\ \Leftrightarrow3x=9\\ \Leftrightarrow x=3\)
\(\left(3x-4\right)^3=125\)
\(\Leftrightarrow\left(3x-4\right)^3=5^3\)
\(\Rightarrow3x-4=5\Leftrightarrow3x=9\Leftrightarrow x=3\)
\(a,5^{x-2}=125\)
\(\Rightarrow5^{x-2}=5^3\)
\(\Rightarrow x-2=3\)
\(\Rightarrow x=5\)
\(b,3^{x+4}=243\)
\(\Rightarrow3^{x+4}=3^5\)
\(\Rightarrow x+4=5\)
\(\Rightarrow x=1\)
\(5^{x-2}=125\)
\(\Rightarrow5^{x-2}=5^3\)
\(\Rightarrow x-2=3\)
\(\Rightarrow x=3+2\)
\(\Rightarrow x=5\)
4:
=>(2x+3,5)=7/12*3/14=21/168=1/8
=>2x=1/8-7/2=1/8-28/8=-27/8
=>x=-27/16
5: =>1/3:3x=-21/4
=>3x=-1/3:21/4=-1/3*4/21=-4/63
=>x=-4/189
6: =>2+7/9-3/4(x+1)=7/9
=>2-3/4(x+1)=0
=>3/4(x+1)=2
=>x+1=2:3/4=2*4/3=8/3
=>x=5/3
a) 25 - 3x = 13
3x = 25 - 13
3x = 12
x = 12 : 3
x = 4
b) 13 + 3(130 - 3x) = 313
3(130 - 3x) = 313 - 13
3(130 - 3x) = 300
130 - 3x = 300 : 3
130 - 3x = 100
3x = 130 - 100
3x = 30
x = 30 : 3
x = 10
a) 294 - ( 7x - 217 ) = 38 . 311 : 311 + 6
294 - ( 7x - 217 ) = 38 . ( 311 : 311 ) + 6
294 - ( 7x - 217 ) = 38 . 1 + 6
294 - ( 7x - 217 ) = 6561 . 1 + 6
294 - ( 7x - 217 ) = 6561 + 6
294 - ( 7x - 217 ) = 6567
( 7x - 217 ) = 294 - 6567
( 7x - 217 ) = - 6273
7x = - 6273 + 217
7x = - 6056
x = - 6056 : 7
x = - 865,1428571
Vậy x = - 865,1428571
b) ( 3x - 4 )3 = 125
( 3x - 4 )3 = 53
( 3x - 4 ) = 5
3x = 5 + 4
3x = 9
x = 9 : 3
x = 3
Vậy x = 3
ok
=> (3x - 4)^3 = 5^3
=> 3x - 4 = 5
=> 3x = 5 + 4
=> 3x = 9
=> x = 9 : 3
=> x = 3