34 . 3x + 3x + 1 = 243
34 . 3x + 3x . 31 = 243
3x . ( 34 + 31 ) = 243
3x . ( 81 + 3 ) = 243
3x . 84 = 243
3x = 243 : 84
3x = .............. = 3....
Suy ra x = .......
Good luck. ( Phần cuối tự tính )
\(\text{Tìm }x\text{ biết : }\)
\(3^x=3\cdot3^2\cdot3^3\cdot3^4\cdot3^5\cdot...\cdot3^{99}\cdot3^{100}\)
1/ 6^x-3=1
2/ 5^x-2=125
3/ 5^x-2=25
4/ 3^x+4=243
Tìm x, biết:
a) \(\dfrac{x}{3}\) - 5 = \(\dfrac{2x}{5}\)
b) 4 + 3x = 8 - x
c) 2 . 3\(^{x+1}\) - 5 . 3\(^x\) = 243
tìm x
a.2^3+2=4^X+5
b.3^x+1=9^x
c.3^2x-1=243
Tìm x:
1) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
2) \(2\cdot3^x=10\cdot3^{12}+8\cdot27^4\)
3) \(\left(19x+2\cdot5^2\right):14=\left(13-8\right)^2-4^2\)
1,tìm x
a.\(3^x\)=81
b.\(5^{x+2}\)=125
c.\(2^3\)*\(2^{x-1}\)=64
d. 7*\(7^{n+1}\)=343
e.\(\left(x+3\right)^5\)=243
f.\(\left(2x-3\right)^6\)=64
g.\(\left(x-6\right)^3\)=\(\left(x-6\right)^2\)
h.\(\left\{\left[\left(2x+14\right):2^2-3\right]:3\right\}\)-1=0
i.\(\left\{\left[\left(x:3+17\right):10+3\cdot2^4\right]:10\right\}=5\)
2,tính
a.\(7^{3^1}\) b.\(7^{1^3}\) c.\(6^{1^{2^{3^4}}}\) d.\(2017^{2^{0^{1^0}}}\) e.\(6^3:6^2-6^2:6\) f.\(\frac{11\cdot2^{22}\cdot3^7-9^{15}}{\left(2\cdot3^{14}\right)^2}\)
\(\frac{2}{2\cdot3}+\frac{2}{3\cdot4}+\frac{2}{4\cdot5}+............+\frac{2}{x+\left(x+1\right)}=\frac{2008}{2010}\)
1. Tìm số tự nhiên x biết 1) 3^x . 3=243 2) 7.2^x=56 3) x^3=8 4)x^20=x 5) 2^x-15=17 6) (2x+1)^3=9.81 7) x^6:x^3=115 8) ( 2x-15)^5=(2x-15)^3 9) 3^x+2-5.3^x=36 10) 7.4^x-1+4^x+1=23 Giúp tớ bài này với
tìm x:
a) 3^x=27
b.2^x:2^3=1
c.27<3^x<243
d.4^x-^3=36
