Tìm x biết :
(1,782x-2-1,78x):1,78x=0
(x-2)8= (x-2)6
(x+2)3=27
(\(\frac{x}{1}\)-\(\frac{1}{4}\))2=\(\frac{1}{4}\)
2x+2x+3=144
81-2x*27x=95
(\(\frac{-1}{3}\))x-3=\(\frac{1}{81}\)
Bạn nào nhanh nhất mình tick
tìm x biết : a,\(\frac{x^7}{81}=27\); b,\(\frac{x^8}{9}=729\); c.\(^{\left[x-\frac{1}{2}\right]^0}\); d,\(\left[X-2\right]^2=1\); e, \(\left[2X-1\right]^3=8\); f,\(\left[X+\frac{1}{2}\right]^2\)=\(\frac{1}{16}\)
1. Tìm x\(\inℚ\), biết:
a)\(\left(x-\frac{1}{2}\right)2=0\)
b)\(\left(x-2\right)^2=1\)
c) \(\left(2x-1\right)^3=-8\)
d)\(\left(x+\frac{1}{2}\right)^2=\frac{1}{16}\)
e)\(\frac{x^7}{81}=27\)
g)\(\frac{x^8}{9}=^{729}\)
\(\frac{9}{27^x}=\frac{3^{x+2}}{81}\)
Tìm x:
a)\(\left(\frac{1}{3}-\frac{1}{2}\right)^{x-1}=\frac{1}{36}\)
b)\(81^{-2x}.27^x=9^5\)
c)\(2^x+2^{x+3}=288\)
Tìm x,y biết:
1) 3^X-1 = 1/243
2) 81^-2X x 27^X=9^5
3) ( x-y+3)^2 + (y-1)^2=0
Tìm số tự nhiên x biết:
a, \(8< 2^x< \frac{2^9}{2^5}\)
b, \(27< 81^3:3^x< 243\)
c, \(\left(\frac{2}{5}\right)^x>\left(\frac{2}{5}\right)^3.\left(-\frac{2}{5}\right)^2\)
CÁC BN GIẢI HỘ MK NHA!!!! *-**.**=*
bài 1: Tìm x,y biết rằng:
\(x+(-\frac{31}{12})^2=\left(\frac{49}{12}\right)^2-x=y^2\)
bài 2: tìm x biết:
a.\(5^x.\left(5^3\right)^2=625\) b.\(\left(\frac{12}{25}\right)^x=\left(\frac{5}{3}\right)^{-2}-\left(-\frac{3}{5}\right)^4\) c.\(\left(-\frac{3}{4}\right)^{3x-1}=\frac{256}{81}\)
d.\(172x^2-7^9:98^3=2^{-3}\)
Bài 3: Tìm x \(\varepsilon\)N biết:
a.\(8< 2^x\le2^9\times2^{-5}\) b.\(27< 81^3:3^x< 243\) \(\left(\frac{2}{5}\right)^x>\left(\frac{5}{2}\right)^{-3}\times\left(-\frac{2}{5}\right)^2\)c.
