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Tìm x hả bạn ?
a ) \(\left(3x+\frac{1}{4}\right)^3=-27\)
\(\left(3x+\frac{1}{4}\right)^3=\left(-3\right)^3\)
\(\Rightarrow3x+\frac{1}{4}=-3\)
\(\Rightarrow3x=-3-\frac{1}{4}=-\frac{13}{4}\)
\(\Rightarrow x=-\frac{13}{4}:3=-\frac{13}{12}\)
Vậy x = \(-\frac{13}{12}\)
cho em hoi câu này xin các anh chị:
10mux x+4y = 2013
\(\left(x-\dfrac{1}{3}\right)^3=-\dfrac{8}{27}\)
=>\(\left(x-\dfrac{1}{3}\right)^3=\left(-\dfrac{2}{3}\right)^3\)
=>\(x-\dfrac{1}{3}=-\dfrac{2}{3}\)
=>\(x=-\dfrac{2}{3}+\dfrac{1}{3}=-\dfrac{1}{3}\)
\(\frac{3^2.3^8}{27^3}=3^x\)
=> \(\frac{3^{2+8}}{3^9}=3^x\)
=> \(\frac{3^{10}}{3^9}=3^x\)
=> \(3^x=3\)
=> \(3^x=3^1\)
=> x = 1
Vũ Hồng Linh bạn check lại bài đầu dùm =_="
\(\left[-\frac{1}{3}\right]^3\cdot x=\frac{1}{81}\)
\(\Leftrightarrow x=\frac{1}{81}:\left[-\frac{1}{3}\right]^3\)
\(\Leftrightarrow x=\frac{1}{81}:\left[-\frac{1}{27}\right]\)
\(\Leftrightarrow x=\frac{1}{81}\cdot(-27)=-\frac{1}{3}\)
\(\left[x-\frac{1}{2}\right]^3=\frac{1}{27}\)
\(\Leftrightarrow\left[x-\frac{1}{2}\right]^3=\left[\frac{1}{3}\right]^3\)
=> Làm nốt
Mấy bài kia cũng làm tương tự
(- \(\dfrac{1}{3}\))3.\(x\) = \(\dfrac{1}{81}\)
\(x=\dfrac{1}{81}\) : (- \(\dfrac{1}{3}\))3
\(x\) = - (\(\dfrac{1}{3}\))4 :(\(\dfrac{1}{3}\))3
\(x=-\dfrac{1}{3}\)
Vậy \(x=-\dfrac{1}{3}\)
\(b;2^6\times125^2=2^6\times5^6=\left(2\times5\right)^6=10^6=1000000\)
`#3107.101107`
`(x - 1/3)^3 = -8/27`
`=> (x - 1/3)^3 = (-2/3)^3`
`=> x - 1/3 = -2/3`
`=> x = -2/3 + 1/3`
`=> x = -1/3`
Vậy, `x = -1/3.`
\(\left(\dfrac{x-1}{3}\right)^3=-\dfrac{8}{27}\)
\(\Rightarrow\left(\dfrac{x-1}{3}\right)^3=\left(\dfrac{-2}{3}\right)^3\)
\(\Rightarrow\dfrac{x-1}{3}=\dfrac{-2}{3}\)
\(\Rightarrow x-1=-2\)
\(\Rightarrow x=-2+1\)
\(\Rightarrow x=-1\)
Vậy $x=-1$.