Khoii Minh 857 Questions 2k Answers 1 Best Answer 23 Points View Profile0 Khoii Minh Asked: Tháng Mười 27, 20202020-10-27T13:56:45+00:00 2020-10-27T13:56:45+00:00In: Môn Toángiúp mik với ạ, mik vote 5* lun, thanks:0giúp mik với ạ, mik vote 5* lun, thanks: ShareFacebookRelated Questions Một hình thang có đáy lớn là 52cm ; đáy bé kém đáy lớn 16cm ; chiều cao kém đáy ... Useful news and important articles APROTININ FROM BOVINE LUNG CELL CULTURE купить онлайн2 AnswersOldestVotedRecentLatifah 850 Questions 2k Answers 1 Best Answer 22 Points View Profile Latifah 2020-10-27T13:57:57+00:00Added an answer on Tháng Mười 27, 2020 at 1:57 chiều TH1: $\dfrac{3}{4}x-\dfrac{4}{5}=\dfrac{1}{2}$$↔\dfrac{3}{4}x=\dfrac{1}{2}+\dfrac{4}{5}$$↔\dfrac{3}{4}x=\dfrac{13}{10}$$↔x=\dfrac{13}{10}:\dfrac{3}{4}$$↔x=\dfrac{13}{10}.\dfrac{4}{3}=\dfrac{26}{15}$TH2: $\dfrac{3}{4}x-\dfrac{4}{5}=-\dfrac{1}{2}$$↔\dfrac{3}{4}x=-\dfrac{1}{2}+\dfrac{4}{5}$$↔\dfrac{3}{4}x=\dfrac{3}{10}$$↔x=\dfrac{3}{10}:\dfrac{3}{4}$$↔x=\dfrac{3}{10}.\dfrac{4}{3}=\dfrac{2}{5}$0Reply Share ShareShare on FacebookMít Mít 858 Questions 2k Answers 0 Best Answers 16 Points View Profile mit 2020-10-27T13:58:01+00:00Added an answer on Tháng Mười 27, 2020 at 1:58 chiều Giải thích các bước giải: `|3/4x-4/5|=1/2``⇔` \(\left[ \begin{array}{l}\dfrac{3}{4}x-\dfrac{4}{5}=\dfrac{1}{2}\text{(Với $x≥\dfrac{16}{15}$)}\\\dfrac{3}{4}x-\dfrac{4}{5}=-\dfrac{1}{2}\text{(Với $x<\dfrac{16}{15}$)}\end{array} \right.\)`⇔` \(\left[ \begin{array}{l}\dfrac{3}{4}x=\dfrac{13}{10}\\\dfrac{3}{4}x=\dfrac{3}{10}\end{array} \right.\)`⇔` \(\left[ \begin{array}{l}x=\dfrac{26}{15}(TM)\\x=\dfrac{2}{5}(TM)\end{array} \right.\) $\text{Vậy $x∈\{\dfrac{2}{5};\dfrac{26}{15}\}$}$Học tốt!!!0Reply Share ShareShare on FacebookLeave an answerLeave an answerHủy By answering, you agree to the Terms of Service and Privacy Policy .* Lưu tên của tôi, email, và trang web trong trình duyệt này cho lần bình luận kế tiếp của tôi.
Latifah
TH1: $\dfrac{3}{4}x-\dfrac{4}{5}=\dfrac{1}{2}$
$↔\dfrac{3}{4}x=\dfrac{1}{2}+\dfrac{4}{5}$
$↔\dfrac{3}{4}x=\dfrac{13}{10}$
$↔x=\dfrac{13}{10}:\dfrac{3}{4}$
$↔x=\dfrac{13}{10}.\dfrac{4}{3}=\dfrac{26}{15}$
TH2: $\dfrac{3}{4}x-\dfrac{4}{5}=-\dfrac{1}{2}$
$↔\dfrac{3}{4}x=-\dfrac{1}{2}+\dfrac{4}{5}$
$↔\dfrac{3}{4}x=\dfrac{3}{10}$
$↔x=\dfrac{3}{10}:\dfrac{3}{4}$
$↔x=\dfrac{3}{10}.\dfrac{4}{3}=\dfrac{2}{5}$
Mít Mít
Giải thích các bước giải:
`|3/4x-4/5|=1/2`
`⇔` \(\left[ \begin{array}{l}\dfrac{3}{4}x-\dfrac{4}{5}=\dfrac{1}{2}\text{(Với $x≥\dfrac{16}{15}$)}\\\dfrac{3}{4}x-\dfrac{4}{5}=-\dfrac{1}{2}\text{(Với $x<\dfrac{16}{15}$)}\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}\dfrac{3}{4}x=\dfrac{13}{10}\\\dfrac{3}{4}x=\dfrac{3}{10}\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}x=\dfrac{26}{15}(TM)\\x=\dfrac{2}{5}(TM)\end{array} \right.\)
$\text{Vậy $x∈\{\dfrac{2}{5};\dfrac{26}{15}\}$}$
Học tốt!!!