Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(2x-15\right)^5=\left(2x-15\right)^3\)
\(\Leftrightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)
\(\Leftrightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)
\(\Leftrightarrow\left(2x-15\right)^3\left(2x-16\right)\left(2x-14\right)=0\)
\(\Leftrightarrow x=\frac{15}{2};8;7\)
a) \(\left(2x-1\right)+\frac{3}{15}=\frac{3}{2}\)
\(\Rightarrow2x-1=\frac{3}{2}-\frac{3}{15}=\frac{13}{10}\)
\(\Rightarrow2x=\frac{13}{10}+1=\frac{23}{10}\)
\(\Rightarrow x=\frac{23}{20}\)
b) \(x+\frac{46}{15}=1,5\)
\(\Rightarrow x+\frac{46}{15}=\frac{3}{2}\)
\(\Rightarrow x=\frac{3}{2}-\frac{46}{15}\)
\(\Rightarrow x=\frac{-47}{30}\)
c) \(\left(-2x+1\right)+\frac{3}{15}=\frac{5}{3}\)
\(\Rightarrow-2x+1=\frac{5}{3}-\frac{3}{15}=\frac{22}{15}\)
\(\Rightarrow-2x=\frac{7}{15}\Rightarrow x=\frac{-7}{30}\)
(2x-15)5=(2x-15)3
=>(2x-15)5-(2x-15)3=0
=>(2x-15)3.(2x-15)2-(2x-15)3.1=0
=>(2x-15)3.((2x-15)2-1)=0
=>(2x-15)3=0=>2x-15=0=>2x=15=>x=15/2
hoặc (2x-15)2-1=0=>(2x-15)2=0=>2x-15=1,-1=>2x=16,14=>x=8,7
Vậy x=15/2,8,7.
ta co ( 2x-15)5= (2x-15)3
=> (2x-15)5-(2x-15)3=0
=> (2x-15)3 .{(2x-15)2-1}=0
=> (2x-15)3=0 hoac (2x-15)2-1=0
=> 2x=15 hoac (2x-15)2=1
=> x=15/2 hoac 2x-15=-1;1
=> x=15/2 hoac 2x= 14;16 => x=7;8
vay x=15/2;7;8
\(\left(2x-15\right)^5=\left(2x-15\right)^3\)
\(\Leftrightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\)
\(\Leftrightarrow\left(2x-15\right)^3\left[\left(2x-15\right)^2-1\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}2x-15=0\\\left(2x-15\right)^2=1\end{cases}}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=15\\2x-15=\pm1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{15}{2}\\2x-15=\pm1\Leftrightarrow\orbr{\begin{cases}2x=16\\2x=14\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=8\\x=7\end{cases}}\end{cases}}}\)\(\Leftrightarrow\orbr{\begin{cases}x=\frac{15}{2}\\2x-15=\pm1\Leftrightarrow\orbr{\begin{cases}2x=16\\2x=14\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=8\\x=7\end{cases}}\end{cases}}\)
(2x - 15)5 = (2x - 15)3
<=> (2x - 15)5 - (2x - 15)3 = 0
<=> (2x - 15)3.[(2x - 15)2 - 1] = 0
<=> \(\orbr{\begin{cases}\left(2x-15\right)^3=0\\\left(2x-15\right)^2-1=0\end{cases}}\)
<=> \(\orbr{\begin{cases}x=\frac{15}{2}\\\left(2x-15\right)^2=1^2=\left(-1\right)^2\end{cases}}\)
<=> \(\orbr{\begin{cases}x=\frac{15}{2}\\\orbr{\begin{cases}2x-15=1\\2x-15=-1\end{cases}}\end{cases}}\)
<=> \(\orbr{\begin{cases}x=\frac{15}{2}\\\orbr{\begin{cases}x=8\\x=-8\end{cases}}\end{cases}}\)
Vậy x = \(\frac{15}{2}\); \(\pm\)8
\(\left(2^x-15\right)^5=\left(2x-15\right)^3\)
\(\Leftrightarrow2^{15x}-15^5=\left(2x\right)^3-15^3\)
\(\Leftrightarrow2^{15x}-8x^3=15^5-15^3\)
... Tự làm tiếp nhé !