Question

5.3*=405

2* :8=4

x mũ 64=x

x mũ 28= x mũ 5

(x-2) mũ 4=243

(x+1) mũ 3=125

ai nhanh mình tick cho!

Answer 1

5.3^x=405

3^x=405:5

3^x=81

3^x=3⁴

^{Vậy x=4}

2^x:8=4

2^x=4.8

2^x=32

2^x=2⁵

^{Vậy x=5}

x²⁸=x⁵

x^28-x^5=0

x^5.x^23-x^5.1=0

x^5.(x^23-1)=0

suy ra x^5=0 hoặc x^23-1=0 suy ra x^5=0^5 hoặc x^23=0+1=1 suy ra x=0 hoặc x^23=1^23 suy ra x=0 hoăc x=1

9

(x-2)^4=256

(x-2)^4=4^4

x-2=4

x=4+2=6

(x+1)^3=125

(x+1)^3=5^3

x+1=5

x=5-1=4