a) -3/4.x - x = 1
=> x.(-3/4 - 1) = 1
=> x . -7/4 = 1
=> x = 1 : -7/4
=> x = -4/7
b) x5 = (2.x)4
=> x5 = 24 . x4
=> x5 : x4 = 24
=> x5 - 4 = 16
=> x = 16
\(-\frac{3}{4}\cdot x-x=1\)
\(\Rightarrow x\left(-\frac{3}{4}-1\right)=1\)
\(\Rightarrow-\frac{7}{4}x=1\)
\(\Rightarrow x=-\frac{4}{7}\)
\(x^5=\left(2x\right)^4\)
\(\Rightarrow x^5=16x^4\)
\(\Rightarrow x^5-16x^4=0\)
\(\Rightarrow x^4.x-16x^4=0\)
\(\Rightarrow x^4\left(x-16\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x^4=0\\x-16=0\end{cases}\Rightarrow}x=16\)
\(a,-\frac{3}{4}.x-x=1\)
\(\Rightarrow x.\left(-\frac{3}{4}-1\right)=1\)
\(\Rightarrow x.\left(-\frac{7}{4}\right)=1\)
\(\Rightarrow x=-\frac{4}{7}\)
\(b,x^5=\left(2.x\right)^4\)
\(\Rightarrow x^5=2^4.x^4\)
\(\Rightarrow x^5:x^4=2^4\)
\(\Rightarrow x^{5-4}=16\)
\(\Rightarrow x=16\)
a) \(\left(-\frac{3}{4}\right).x-x=1\) b)\(x^5=\left(2.x\right)^4\)
\(x.\left[\left(-\frac{3}{4}\right)-1\right]=1\) \(x^5=2^4.x^4\)
\(x.\left(-\frac{7}{4}\right)=1\) \(x^5:x^4=2^4\)
\(x=1:\left(-\frac{7}{4}\right)\) \(x^{5-4}=16\)
\(x=-\frac{4}{7}\) \(x=16\)
bạn ơi dấu . là nhân nhé
chúc học tốt
-3/4 x X-X=1
=>X(-3/4-1)=1
=>X x (-7/4)=1
=>X=1: (-7/4)
VẬY X=-4/7
B) X5 = (2X)4
=>X MŨ5 =2 MŨ 4 X X MŨ 4
=>X MŨ 5 : X MŨ 4= 16
=>X=16
cÁC BẠN NHỚ K ĐÚNG CHO I NHF RỒI MÌNH K LẠI CHO. NHỚ MỖI BẠN 3 K