(x-1)5= -243 (x-1)5=-35 => x-1=-3
x= -3+1
x=-2 k cho mik nha
mik co het suc viet do
(x-1)5= -243 (x-1)5=-35 => x-1=-3
x= -3+1
x=-2 k cho mik nha
mik co het suc viet do
Tìm x ∈ N biết :
a) \(8< 2^x\le2^9.2^{-5}\)
b)\(27< 81^3:3^x< 243\)
c)\(\left(\dfrac{2}{5}\right)^x>\left(\dfrac{5}{2}\right)^{-3}.\left(\dfrac{-3}{5}\right)^2\)
Tìm số hữu tỉ x biết \(\left(x-1\right)^5=-243\)
Tìm x biết : \(\left(\frac{1}{3}\right)^x\left(\frac{1}{9}\right)^x\left(\frac{1}{27}\right)^x\left(\frac{1}{81}\right)^x\left(\frac{1}{243}\right)^x=\left(-\frac{1}{3}\right)^{30}\)
Tìm x biết:
\(\left(\frac{3}{5}\right)^x.\left(\frac{625}{81}\right)^3=\frac{243}{3125}\)
Tìm x, biết :
a) \(\left(x-\frac{1}{5}\right)^5\)=\(\frac{1}{243}\)
b) | 2x - 1 | - x = 1
c)\(\left|\frac{3}{5}-\frac{1}{2}x\right|\)>\(\frac{2}{5}\)
Tìm x,y,z:
1, \(\left(3x-2\right)^5=243\)
2, \(\left(x-5\right)^x=\left(x-3\right)^2\)
Tìm x, biết:
a) \(\left(-\dfrac{1}{3}\right)^3\) .x = \(\dfrac{1}{81}\)
b) 22 . 16 >2x > 42
c) 9.27 < 3x < 243
Tìm x \(\in\) N biết :
a)\(8< 2^x\le2^9.2^{-5}\)
b) \(27< 81^3:3^x< 243\)
c)\(\left(\frac{2}{5}\right)^x>\left(\frac{5}{2}\right)^{-3}.\left(\frac{-2}{5}\right)^2\)
Tìm \(x\in Q\),biết :
a) \(\left(2x-3\right)^2=16\)
b) \(\left(3x-2\right)^5=-243\)
c) \(\left(7x+2\right)^{-1}=3^{-2}\)