Question

giúp tớ

Answer 1

\(a,2^x\cdot4=128\\ \Leftrightarrow2^x=32\\ \Leftrightarrow x=5\\ b,\left(2x+1\right)^3=125\\ \Leftrightarrow2x+1=5\\ \Leftrightarrow x=2\\ c,2^x-26=6\\ \Leftrightarrow2^x=32\\ \Leftrightarrow x=5\\ d,64\cdot4^x=4^5\\ \Leftrightarrow4^x=16\\ \Leftrightarrow x=2\\ e,27\cdot3^x=243\\ \Leftrightarrow3^x=9\\ \Leftrightarrow x=2\)

Answer 2

a: =>2^x=128/4=32

=>2^x=2^5

=>x=5

b: =>(2x+1)^3=5^3

=>2x+1=5

=>2x=4

=>x=2

c: =>2^x=32

=>2^x=2^5

=>x=5

d: =>4^x=4^5:4^3=4^2

=>x=2

e: =>3^x=243/27=9=3^2

=>x=2

f: =>7^x=49

=>7^x=7^2

=>x=2

g: =>3^x=3^4

=>x=4

h: =>3^x=3^7/3^4=3^3

=>x=3

i: =>3^x+25=26*4+2=104+2=106

=>3^x=81

=>x=4

Answer 3

\(f,47\cdot7^x=2401\\ \Leftrightarrow7^x=49\\ \Leftrightarrow x=2\\ g,3^x=81\\ \Leftrightarrow x=4\\ h,3^4\cdot3^x=3^7\\ \Leftrightarrow3^x=3^3\\ \Leftrightarrow x=3\\ i,3^x+25=26\cdot2^2+2\cdot3^0\\ \Leftrightarrow3^x=81\\ \Leftrightarrow x=4\)