Question

[30-Thạch Lê Dũng -6a2]

a) x³=27, b) (2x-1)³=8,c)(x-2)²=16,d) (2x-3)²=9,e)2x+5=3⁴:3²,f)(3x-2⁴.7³=2.⁷⁴

Answer 1

[Hải Đăng Nguyễn]

a)x³=3³

 ⇔x=3

Answer 2

[Nguyễn Hoàng Minh]

\(a,\Rightarrow x=3\\ b,\Rightarrow2x-1=2\Rightarrow x=\dfrac{3}{2}\\ c,\Rightarrow\left[{}\begin{matrix}x-2=4\\x-2=-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=6\\x=-2\end{matrix}\right.\\ d,\Rightarrow\left[{}\begin{matrix}2x-3=3\\2x-3=-3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=0\end{matrix}\right.\\ e,\Rightarrow2x+5=3^2=9\Rightarrow x=2\)