Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
ngôlãmtân
\(3^{3x}+3^{3x+2}=7290\)
\(3^{3x}+3^{3x}.3^2=7290\)
\(3^{3x}.\left(1+3^2\right)=7290\)
\(3^{3x}.\left(1+9\right)=7290\)
\(3^{3x}.10=7290\)
\(3^{3x}=\frac{7290}{10}\)
\(3^{3x}=729\)
\(3^{3x}=3^6\)
\(\Rightarrow3x=6\)
\(\Rightarrow x=2\)
vậy \(x=2\)
P/S: đừng ai copy bài mình nhé
A) \(\frac{2}{3}-\left(\frac{3}{4}-x\right)=\frac{1}{3}\)
\(\Rightarrow\frac{3}{4}-x=\frac{2}{3}-\frac{1}{3}\)
\(\Rightarrow\frac{3}{4}-x=\frac{1}{3}\)
\(\Rightarrow x=\frac{3}{4}-\frac{1}{3}\)
\(\Rightarrow x=\frac{5}{12}\)
Vậy \(x=\frac{5}{12}\)
B) \(3^{3x}+3^{3x+2}=7290\)
\(\Rightarrow3^{3x}+3^{3x}\times3^2=7290\)
\(\Rightarrow3^{3x}\times\left(1+3^2\right)=7290\)
\(\Rightarrow3^{3x}\times10=7290\)
\(\Rightarrow3^{3x}=7290:10\)
\(\Rightarrow3^{3x}=729\)
\(\Rightarrow3^{3x}=3^6\)
\(\Rightarrow3x=6\)
\(\Rightarrow x=6:3\)
\(\Rightarrow x=2\)
Vậy x = 2
_Chúc bạn học tốt_
\(\frac{2}{3}-\left(\frac{3}{4}-x\right)=\frac{1}{3}\)
\(\frac{3}{4}-x=\frac{2}{3}-\frac{1}{3}\)
\(\frac{3}{4}-x=\frac{1}{3}\)
\(x=\frac{3}{4}-\frac{1}{3}\)
\(x=\frac{5}{12}\)
\(3^{3x}+3^{3x+2}=7290\)
\(3^{3x}\left(1+3^2\right)=7290\)
\(3^{3x}\cdot10=7290\)
\(3^{3x}=729\)
\(3^{3x}=3^6\)
\(\Rightarrow3x=6\)
\(x=2\)
Không cần k nha ! Học tốt ....
\(3^{5x}+3^{5x+2}=7290\)
\(\Leftrightarrow3^{5x}+3^{5x}.9=7290\)
\(\Leftrightarrow3^{5x}\left(1+9\right)=7290\)
\(\Leftrightarrow3^{5x}.10=7290\)
\(\Leftrightarrow3^{5x}=729=3^6\)
\(\Rightarrow5x=6\rightarrow x=\frac{6}{5}\)
học tốt ~~
\(3^x+3^{x+2}=7290\)
\(3^x+3^x.3^2=7290\)
\(3^x.\left(1+9\right)=7290\)
\(3^x.10=7290\)
\(\Rightarrow3^x=729\)
\(\Rightarrow x=6\)
\(3^x+3^{x+2}=7290\Rightarrow3^x.\left(1+3^2\right)=7290\Rightarrow3^x=729=3^6\Rightarrow x=6\)
R(x) = 2x2 + 3x - 1
- M(x) = -x3 + x2
x3 + x2 + 3x - 1
Vậy R(x) - M(x) = x3 + x2 + 3x - 1
a: Sửa đề: 6x^3
\(\dfrac{6x^3-4x^2+3x-2}{3x-2}=\dfrac{2x^2\left(3x-2\right)+3x-2}{3x-2}=2x^2+1\)
b: \(\dfrac{6x^3-3x^2+4x+2}{3x^2+2}\)
\(=\dfrac{6x^3+4x-3x^2-2+4}{3x^2+2}\)
\(=2x-1+\dfrac{4}{3x^2+2}\)
\(P\left(x\right)=3x^4+9x^2-2x-3\)
\(Q\left(x\right)=\left(3x^4-3x^4\right)+\left(x^2-4x^2+1.5x^2\right)+2x+1=-1.5x^2+2x+1\)
\(3^x\left(1+3^2\right)=7290\\ \Rightarrow3^x.10=7290\\ \Rightarrow3^x=729=3^6\\ \Rightarrow x=6\)