Câu 15(1,5?iêm). Tham gia T?t tr?ng cây, s? cây tr?ng ???c c?a be l?p 7A, 7B, 7 C l?n l??t ti l? v?i \( 5 ; 6 \); 4. T?nh s? cây tr?ng ???c c?a m?i l?p, bi?t r?ng l?p 7A tr?ng ???c h?n l?p 7 C là 2 cây. Câu \( 16(2,5 \) ?i?m). Cho tam giác ABC vuông t?i A , ???ng phân giâc BD . G?i E là chân ???ng vuông góc kè t? D ??n BC . a) Ch?ng minh r?ng \( \triangle \mathrm{ABD}=\triangle \mathrm{EBD} \) b) Ch?ng minh: BD là ???ng trung tr?c c?a ?o?n th?ng AE c) \( \mathrm{Các} \) ???ng th?ng AB và DE c?t nhau t?i ?i?m F . Ch?ng minh r?ng BD vuông oóc v?i EC
Added by Hùng N.
Close
Step 1
Let \( x \) be the common ratio. Then, the number of trees planted by class 7A is \( 5x \), by class 7B is \( 6x \), and by class 7C is \( 4x \). Show more…
Show all steps
Your feedback will help us improve your experience
Melissa Munoz and 71 other Organic Chemistry educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Melissa M.
$\mathrm{B}$ and $\mathrm{C}$ are trisection points of $\overline{\mathrm{AD}},$ and $\overline{\mathrm{AD}}=12$ a Find $\mathrm{AB}$. b Find AC. c If $A B=x+3,$ solve for $x .$ d If $A B=x+3$ and $A E=3 x+6$ find AE. e What segment is C the midpoint of? f Do $\overrightarrow{\mathrm{EB}}$ and $\overrightarrow{\mathrm{EC}}$ trisect $\angle \mathrm{AED}$ ? (GRAPH CAN'T COPY)
Intruduction to Geometry
Division of Segments and Angles
see attached.
Matthew W.
Recommended Textbooks
Organic Chemistry
Watch the video solution with this free unlock.
EMAIL
PASSWORD