1, 5.3\(^x\)=5.3\(^4\) 2, 7.4\(^x\)=7.4\(^3\) 3, 8.7\(^x\)=8.7\(^6\)
4, 2\(^x\)=2.2\(^8\) 5, 6.8\(^{x-1}\)+8\(^{x+1}\)=6.8\(^{19}\)+8\(^{21}\) 6, 4.3\(^{x-2}\)+2.3\(^{x+1}\)=4.3\(^4\)+2.3\(^7\)
7,(3x-4)\(^6\)=(3x-4)\(^2\) (\(\dfrac{1}{2}\)-\(\dfrac{1}{6}\)):3\(^x\)+3\(^{x+2}\)=3\(^{16}\)+3\(^{13}\)
1: \(5\cdot3^x=5\cdot3^4\)
nên \(3^x=3^4\)
hay x=4
2: \(7\cdot4^x=7\cdot4^3\)
nên \(4^x=4^3\)
hay x=3
3: \(8\cdot7^x=8\cdot7^6\)
nên \(7^x=7^6\)
hay x=6
: 5⋅3mũx=5⋅34
nên 3x=34
vậy x=4
2: 7⋅4x=7⋅43
nên 4x=43
vậy x=3
3: 8⋅7x=8⋅7mũ6⋅
nên 7x=76