\(2^{3x+3}-8^x=56\)
\(\Rightarrow2^{3x+3}-\left(2^3\right)^x=56\)
\(\Rightarrow2^{3x+3}-2^{3x}=56\)
\(\Rightarrow2^{3x}\left(2^3-1\right)=56\)
\(\Rightarrow2^{3x}\cdot7=56\)
\(\Rightarrow2^{3x}=56:7\)
\(\Rightarrow2^{3x}=8\)
\(\Rightarrow2^{3x}=2^3\)
\(\Rightarrow3x=3\)
\(\Rightarrow x=1\)
2^3x+3 - 8^x
x+5=3x-8
Tìm x :
a) (3x2 - 5) + 34 + 60 = 53
b) 3x + 2x ( 23 . 5 - 32 . 4 ) + 52 = 44
bài 2 viết mỗi tích, thương sau dưới dạng luỹ thừa
a) 4^10 x 2^30 b) 9^25 x 27^4 x 81^3 c) 25^50 x 125^5 d) 64^3 x 4^8 x 16^4
e)3^8:3^6 ; 2^10:8^3 ; 12^7 :6^7 ; 31^5 ; 81^3
f) 5^8 : 25^2 ; 4^9:64^2 ; 2^25 : 32^4 ; 125^3 : 25^4
Bài 1: So sánh
a)\(^{56^{56}-56^{56}}\)và \(^{56^{56}-56^{54}}\)
b)\(3^5.7^{15}\) và \(27^5.7^{16}\)
Bài 1: Tìm x là STN biết:
1/ 5x - 2 - 32 = 24 - ( 68 : 66 - 62)
2/ 3x + 42 = 196 : (193 x 192) - 3.12014
3/ 2x + 2x + 4 = 272
4/ 3 + 2x - 1 = 24 - \([4^2-(2^2-1)]\)
tim x thuoc N
a,\(21x-1⋮11\)
b,\(5x+1⋮7\) va x la STN lon nhat co 3 chu so
c,\(3x-2⋮11\) va \(100< x< 2017\)
d,\(5⋮\left(x-3\right)\)
e,\(\left(3x+2\right)⋮\left(x+1\right)\)
2 . ( x + 3 ) + [ 38 - ( 12 - 9 ) 3 ] = 2 . ( x + 1 ) + 8 3
A.3^x=243 B.4^x=4096 C. 5^3-x=25 D.8^2x-3=512 E.2214-5.7^2x-3=499 J. 2^x+3+2^x+1=80
