`(x-1)^2=1`
`=>(x-1)^2=1^2`
\(\Rightarrow\left[{}\begin{matrix}x-1=1\\x-1=-1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=0\end{matrix}\right.\)
`----------`
`7^(2x-6)=49`
`=> 7^(2x-6)=7^2`
`=> 2x-6=7`
`=>2x=7+6`
`=>2x= 13`
`=>x=13:2`
`=>x=13/2`
`--------`
`(2x-16)^7=128`
`=>(2x-16)^7=2^7`
`=>2x-16=2`
`=>2x=2+16`
`=>2x=18`
`=>x=18:2`
`=>x=9`
1. Tìm x ∈ N sao cho:
a) (x - 1)2 = 1 b) 72x - 6 = 49 c) (2x - 16)7 = 128
Tìm x :
a) (x-1)^2 = 1
b) 7^2x-6 = 49
a) 1/3x - 1/4x = 1
b) 4/5 + 5/7: x = 1/6
c) 2x/3 - x/4 = 5/6. cảm ơn :D
a)(x+1)(y+2)=4 d)2xy+6x+y=1
b)(2x-1)(y-1)=7 nhớ kẻ bảng ra cho mk nha
c)x+6=y(x-1
2. tìm x
a) \(\left(x-1\right)^3=8\)
b) \(7^{2x-6}=49\)
c) \(\left(2x-14\right)^7=128\)
d) \(x^4.x^5=5^3.5^6\)
e) \(\left[3.\left(x+2\right):7\right].4=120\)
tìm x thuộc số tự nhiên
a)2 mũ x=16 , 2 mũ x =128
b)3 mũ x =27 , 3 mũ x =81
c)4 mũ x=64
d)5 mũ 2x=625
e)6 mũ 2x +1=216
bài 1 tìm x
a. 5 - 3(x+4) = -1
b.(x-1) - (x+2) = 0
c.( \(\dfrac{1}{2}\) + x )-( \(\dfrac{1}{3}\) - x) = 0
d. 2x2 - 3 = 5
e. x(2x -1) = 0
g. \(\dfrac{1}{3}\) . x2 - \(\dfrac{1}{6}\)=\(\dfrac{7}{6}\)
(2x-16)^7 = 128
