Cho tam giác ABC nhọn có 3 đường cao AA

NT

Nguyễn Thị Yến Nga

5 tháng 8 2019

Cho tam giác ABC nhọn có 3 đường cao AA', BB', CC' cắt nhau tại H. Gọi I là giao điểm của B'C' và AH. Chứng minh rằng HI.AA' = AI.HA'

#Toán lớp 8

0

D

dsfdsf

13 tháng 1 2020 - olm

cho tam giác abc có 3 góc nhọn. phía ngoài tam giác abc dựng các hình vuông abed, bcgf, achi có tâm lần lượt là c’, a’, b’. chứng minh: aa' = b'c' cho tam giác abc có 3 góc nhọn. phía ngoài tam giác abc dựng các hình vuông abed, bcgf, achi có tâm lần lượt là c’, a’, b’. chứng minh: aa' = b'c'cho tam giác abc có 3 góc nhọn. phía ngoài tam giác abc dựng các hình vuông abed, bcgf, achi có tâm lần lượt là c’, a’,...

Đọc tiếp

cho tam giác abc có 3 góc nhọn. phía ngoài tam giác abc dựng các hình vuông abed, bcgf, achi có tâm lần lượt là c’, a’, b’. chứng minh: aa' = b'c'

#Toán lớp 8

1

TV

Trịnh Việt Dũng

15 tháng 6 2022

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Đúng(0)

NK

Nam Khanh Le

10 tháng 4 2018 - olm

Cho tam giác ABC nhọn có các đường cao AA';BB';CC'. Gọi H là trực tâm tam giác ABC. CMR:\( {(AB+BC+AC)^2 \over AA'^2+BB'^2+CC'^2} >=4\)

#Toán lớp 8

0

NH

Nam Hoài

10 tháng 5 2023

Cho tam giác ABC có 3 góc nhọn nội tiếp (O) . Gọi H là giao điểm của 3 đường cao AA,BB′, CC′ của tam giác . D, E, F lần lượt là giao điểm của AA’, BB, CC′ với (O) .
Tìm GTNN của biểu thức :
Q=AA'/A'D - BB'/B'E + CC'/C'F

#Toán lớp 9

0

NC

Nguyen Cong Anh Nguyen

21 tháng 12 2018 - olm

cho tam giác nhọn abc và 3 đường cao aa' , bb', cc' cắt nhau tại h . Biết ah/aa'=bh/bb'=ch/cc' . CMR tam giác abc là tam giác đều

Ai giúp mik với !!!!!!!!!!

#Toán lớp 8

0

TP

Thủy Phạm Thanh

14 tháng 11 2017 - olm

Cho tam giác ABc nhọn có ba đường cao AA' , BB' , CC" giao nhau ở H. CMR \(\frac{HA}{AA'}-\frac{HB}{BB'}-\frac{HC}{CC'}=1\)

#Toán lớp 9

0

BC

Big City Boy

7 tháng 3 2021

Cho tam giác ABC có 3 góc nhọn. 3 đường cao AA', BB', CC' cắt nhau tại H; A1, B1, C1 là các điểm đối xứng của H qua BC, AC,AB. CM: \(\dfrac{AA_1}{AA'}+\dfrac{BB_1}{BB'}+\dfrac{CC_1}{CC'}\) không đổi

#Toán lớp 8

1

E

Etermintrude💫

7 tháng 3 2021

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Đúng(2)

PT

Pham Trong Bach

25 tháng 3 2017

Cho tam giác ABC nhọn. Các đường cao AA’, BB’, CC’ cắt nhau tại H. Tổng H A ' A A ' + H B ' B B ' + H C ' C C ' bằng?

#Toán lớp 8

1

CM

Cao Minh Tâm

25 tháng 3 2017

1

Đúng(0)

VD

Vietanh Do

21 tháng 6 2015 - olm

Cho tam giác ABC có 3 góc nhọn (AB<AC), nội tiếp đường tròn tâm O. Kẻ đường cao AD của tam giác ABC và đường kính AA" của đường tròn tâm O. Gọi M là chân đường vuông góc kẻ từ B xuống AA', I là trung điểm của BC. Chứng minh rằng: