Given log42 8x = 2 log28. log4 2 8x = 2 log 22 3. log4 2 8x = 2 3 log22. log4 2 8x = 2 3 = 8. 2 8x = 4 8. (2 2 ) 4x = 4 8. ⇒ (4) 4x = 4 8. ⇒ 4x = 8. ⇒ x = 8 4 = 2.
確定！ 回上一頁
