Các câu hỏi tương tự
Giai ho minh de nay voi cac p:cho tam giac ABC can tai A,duong cao AH,AB=8cm,BC=10cm
a,tinh BH,AH
b,goi BK va CI la cac duong phan giac cua tam giac ABC,chung minh rang tu giac BIKC la hinh thang can
cho tam giac ABC, AD la duong phan giac cat duong trung truc cua BC tai E, goi M va N la trung diem cua BE va AE. chung minh rang goc ANB= goc BMD
( giai nhanh dum minh nha)
cho tam giac abc co a=120o ad la duong phan giac. chung minh rang 1/ab+1/ac=1/ad
cho tam giac abc co a=120o ad la duong phan giac. chung minh rang 1/ab+1/ac=1/ad
Cho tam giac ABC vuong tai A ,phan giac BD .K etia DE vuong goc BC (E\(\in\)BC).Tren tia doi cua tia AB lay diem F sao cho AF =CE .Chung minh rang :
a) BD la duong trung truc cua AE
b) AD<DC
c) Ba điểm E,D,F thẳng hàng
cho tam giac ABC co A> 90 do trong goc A ve cac doan thang AD,AE sao cho AD vuong goc AB , AE vuong goc AC goi M la trung diem cua DE chung minh rang AM vuong goc BC
cho tam giac ABC nhon (AB<AC)
cac duong cao AD ,BE,CF cat nhau tai
a, cm HE.HB =HF.HC
b.CM TAM GIACEHF~tam giac CHB
c. cm EH la phan giac DEF
d, BIET HA/HB=2/3 . Tinh Saef./Sde
mn giup em nhanh dc ko a em dang can gap ~~ ~~
.........
cau 1 giai phuong trinh sau a) 7 x -14 0 b) ( 3x +1 ) ( 2x-2) 0 c) ( 3x -1 ) x-2 cau 2 giai bat phuong trinh va bieu dien truc nghiem tren truc so a ) 2x+5 hoac ( )9 b) 3x +4 5x-3 c ) 3x-1 tren 4 2cau 3 cho tam giac a bc vuong goc tai a , co ab 12 cm , ac 16 cm . ke duong cao ah ( hthuoc bc )a) chung minh : tam giac hba thuoc tam giac abc b) tinh do dai bc,ah c) he ad,de,df,la phan giac lan luot cua cac goc bac,hdb,adc,c thuoc a b , d thuoc bc, f thuoc ab chung minh rang : ea phan eb db...
Đọc tiếp
cau 1 giai phuong trinh sau
a) 7 x -14 =0
b) ( 3x +1 ) ( 2x-2) =0
c) ( 3x -1 ) = x-2
cau 2 giai bat phuong trinh va bieu dien truc nghiem tren truc so
a ) 2x+5 < hoac ( = )9
b) 3x +4 <5x-3
c ) 3x-1 tren 4 >2
cau 3 cho tam giac a bc vuong goc tai a , co ab = 12 cm , ac =16 cm . ke duong cao ah ( hthuoc bc )
a) chung minh : tam giac hba thuoc tam giac abc
b) tinh do dai bc,ah
c) he ad,de,df,la phan giac lan luot cua cac goc bac,hdb,adc,c thuoc a b , d thuoc bc, f thuoc ab
chung minh rang : ea phan eb = db phan dc , fc phan fa = 1
ban nao nhanh minh k cho 10 k
cho tam giac ABC co AB = 3cm AC = 4cm BC =5cm ke duong thang AH
chung minh tam giac ABC vuong
tren canh BC lay D sao cho BD=BA tren canh AC lay diem E sao cho AE=AH
goi F la giao diem cua DE va AH chung minh
DE vuong AC
tam giac ACF can
BC+AH> AC+AB