Đáp án:
`↓↓↓`
Giải thích các bước giải:
`10.3^{3.(x-2)}=(3^{117}+3^{115}):3^{100}`
`10.3^{3.( x - 2)} =3^{117}:3^100 + 3^115 : 3^100`
`10.3^{3.( x - 2)} =3^{17}+ 3^{15}`
`10.3^{3.( x - 2)} = 3^{15}.(3^2 + 1)`
`10.3^{3.( x - 2)} =3^15 . ( 9+1)`
`10.3^{3.( x - 2)} =3^15 . 10`
`→` `3^{3.( x - 2)}=3^15`
`→` `3.(x-2)=15`
`x-2=15:3`
`x-2=5`
`x` `=5+2`
`x` `=7`