Đáp án:
`(1/2)^x=1/8`
`=>(1/2)^x=(1/2)^3`
`=>x=3`
Vậy `x=3`
`5^{2x-1}=125`
`=>5^{2x-1}=5^3`
`=>2x-1=3`
`=>2x=4`
`=>x=2`
Vậy `x=2`
`5^{2x+1}=125^{x+25}`
`=>5^{2x+1}=(5^3)^{x+25}`
`=>5^{2x+1}=5^{3(x+25)}`
`=>2x+1=3(x+25)`
`=>2x+1=3x+75`
`=>3x-2x=1-75`
`=>x=-74`
Vậy `x=-74`
`2x=4^5*4^3`
`=>2x=4^{5+3}`
`=>2x=4^8`
`=>x=(4^8)/2=(2^16)/2=2^15`
Vậy `x=2^15`
`(2^4-x)/16^5=32^6`
`=>(2^4-x)/(2^4)^5=(2^5)^6`
`=>(2^4-x)/2^20=2^30`
`=>2^4-x=2^50`
`=>x=2^4-2^50`
Vậy `x=2^4-2^50`
