Lời giải:
$2^{x-1}.3^y=12^x=(2^2)^x.3^x=2^{2x}.3^x$
$\Rightarrow x-1=2x$ và $y=x$
$\Rightarrow x=y=-1$
Lời giải:
$2^{x-1}.3^y=12^x=(2^2)^x.3^x=2^{2x}.3^x$
$\Rightarrow x-1=2x$ và $y=x$
$\Rightarrow x=y=-1$
\(a,2^{x+1}\cdot3^y=12^x\)
1) |x|+|x+2|=3
2) |\(x^2\)-2x|=x
3) \(2^{x+1}\cdot3^7=12^x\)
4) \(10^x:5^y=20^y\)
Tim x biết \(2\cdot3^{x+2}+4\cdot3^{x+1}=10\cdot3^6\)
tim x biet : \(2\cdot3^{x+2}+4\cdot3^{x+1}=10\cdot3^6\)
Tìm các số tự nhiên x,y biết:
a) \(2^{x+1}\cdot3^y=12^x\)
b) \(10^x\div5^y=12^x\)
c) \(2^x=4^{y-1}\text{ }\)và \(27^y=3^{\text{ }x+8}\)
bai 1: Tim x biet
\(\hept{\begin{cases}x-y=\frac{3}{10}\\y\left(x-y\right)=-\frac{3}{50}\end{cases}}\)
bai 2: Tim x, y biet:
x+\(\left(-\frac{31}{12}\right)^2\)=\(\left(\frac{49}{12}\right)^2\)-x=y2
Bai 9: Tim x,y,z biet:
(x-1)2+(x+y)2+(xy-z)2=0
1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
tim x,y,z biet 4/x+1=2/y-2=3/z+2 va xyz=12
Tìm x,y biết
a,\(\left(2^3\right)^{1^{2005}}\cdot x+2005^0\cdot x=994-15:3+1^{2025}\)
b,\(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
c,\(2024^{|x-1|+y^2-1}\cdot3^{2024}=9^{1012}\)