a) (x+15) : 5 + 22= 24
b) (x – 36 ) : 18 = 12
c) (x – 3) ^ 2 = 16
d) 3^2x-1 = 27
e) (2 + x) ^ 3 = 8
Mong mn giúp =)
a) (x+15) : 5 + 22= 24 b) (x – 36 ) : 18 = 12 c) (x – 3) ^ 2 = 16 d) 3^2x-1 = 27 e) (2 + x) ^ 3 = 8 Mong mn giúp =)
By Jade
By Jade
a) (x+15) : 5 + 22= 24
b) (x – 36 ) : 18 = 12
c) (x – 3) ^ 2 = 16
d) 3^2x-1 = 27
e) (2 + x) ^ 3 = 8
Mong mn giúp =)
a,(x+15):5+22=24
⇔(x+15) : 5 =2
⇔ x+15 =10
⇔x = -5
b.(x-36):18=12
⇔x-36=216
⇔x=252
c.(x-3)²=16
⇔\(\left[ \begin{array}{l}x-3=4\\x-3=-4\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=7\\x=-1\end{array} \right.\)
d.$3^{2x-1}$=27
⇔3³=27
⇒2x-1=3
⇔x=2
e.(2+x)³=8
⇔(2+x)³=2³
⇒2+x=2
⇔x=0
`(x+15) : 5 + 22= 24`
`=> (x+15) : 5 = 2`
`=> x + 15 = 10`
`=> x = -5`
`(x – 36 ) : 18 = 12`
`=> x – 36 = 216`
`=> x = 252`
`(x – 3) ^ 2 = 16`
`=> (x – 3) ^ 2 = 4^2`
`=>` \(\left[ \begin{array}{l}x-3=4\\x-3=-4\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=7\\x=-1\end{array} \right.\)
`3^(2x-1) = 27`
`=> 3^(2x-1) = 3^3`
`=> 2x -1 = 3`
`=> 2x = 4`
`=> x = 2`
`(2 + x) ^ 3 = 8`
`=> (2 + x) ^ 3 = 2^3`
`=> 2 + x = 2`
`=> x = 0`
(Chúc bạn học tốt)