Nho 45 Questions 855 Answers 0 Best Answers 20 Points View Profile0 Nho Asked: October 14, 20202020-10-14T02:00:51+00:00 2020-10-14T02:00:51+00:00In: Môn Toánbài 1 : tìm x 2^x+2+2^x=400bài 1 : tìm x 2^x+2+2^x=40 ShareFacebookRelated Questions 7/9 - 5/9 : x = 1/6 Mong Mn giúp Làm từ bài 37 đến 39 trong ( sbt toán tập 1) đại nha Lm hay ko copy tui vote 5s Giải các pt nghiệm nguyên sau: a, 2018xy = x + y b, x ² - y ² + 7x = 0 2 AnswersOldestVotedRecentSapo 44 Questions 813 Answers 0 Best Answers 20 Points View Profile Sapo1 2020-10-14T02:01:57+00:00Added an answer on October 14, 2020 at 2:01 am Đáp án: $x=3$Giải thích các bước giải: $2^{x+2}+2^x=40$$⇒2^x.4+2^x=40$$⇒2^x.(4+1)=40$$⇒2^x.5=40$$⇒2^x=8$$⇒2^x=2^3$$⇒x=3$0Reply Share ShareShare on FacebookEuphemia 41 Questions 788 Answers 0 Best Answers 20 Points View Profile Euphemia 2020-10-14T02:02:17+00:00Added an answer on October 14, 2020 at 2:02 am `2^(x+2)+2^x=40``↔2^x(2^2+1)=40``↔2^x·5=40``↔2^x=8``↔2^x=2^3``↔x=3`0Reply Share ShareShare on FacebookLeave an answerLeave an answerCancel reply Featured image Select file Browse Save my name, email, and website in this browser for the next time I comment.
Sapo
Đáp án:
$x=3$
Giải thích các bước giải:
$2^{x+2}+2^x=40$
$⇒2^x.4+2^x=40$
$⇒2^x.(4+1)=40$
$⇒2^x.5=40$
$⇒2^x=8$
$⇒2^x=2^3$
$⇒x=3$
Euphemia
`2^(x+2)+2^x=40`
`↔2^x(2^2+1)=40`
`↔2^x·5=40`
`↔2^x=8`
`↔2^x=2^3`
`↔x=3`