chung minh rang : a/b= c/d suy ra a/b=a+c/b+d
giup minh nhe !!! cam on nhieu minh se mk voi???
Cho a = b + c va c = bd/b -d ( b , d khac 0 ) .chung minh rang a/b = c/d
chung minh rang tu ti le thuc a/b=c/d (a-b khac 0,c-d khac 0) ta co the suy ra ti le thuc a+b/a-b=c+d/c
ai giai nhanh va dung cho toi hieu toi se tich nguoi do
cho tam giac ABC vuong tai A. Diem M la trung diem cua canh BC. Tren tia doi cua tia MA lay diem D sao cho MA=MD. Chung minh rang a) tam giac AMC=tam giac DMB, b) AC=BD, c) AB vuong goc voi BD, d) AM=1/2BC. Cac ban co giup minh nhanh nhat co the nha
giup em voi
cho ti le thuc \(\frac{a+b}{b+c}=\frac{c+d}{d+a}\)
chung minh rang |a| = |c| hoac |a+b| +|c=d|
ai lam nhanh nhat, dung nhat em tick choa
cho a,b,c,d thuoc Z va 0<a<b<c<d chung minh rang neu a/bc/d thi a+d>b+c
cho tam giac abc can tai A co A<90 do ke BD vuong goc voiAC (D€AC) ,CE vuong goc voi AB (E€AB) .goi I la giao diem cua bd va ce. c/m rang .a) ad=ae b)de//bc.c)goi m la giao diem cua bc .chung minh ba diem a,i,m thang hang .d)ai^2+be^2=ad^2+bi^2.
Biet lam chi giup minh phan d voi con ko biet thi thoi nhe 29 dang bai cac ban cu bao nghi de lam gi tet den gan sat dit ma ko lam nhanh thi dinh an tet nua hay thoi .Thong cam cho minh nhe nhe
Thank you cac ban chuc cac ban nam moi an lanh hoc that gioi nhe!
cho hai so huu ti a/b va c/d voi mau duong, trong do a/b < c/d . chung minh rang :
a . ad < bc b . a/b < a+c / b+d < c/d
giup mk nha
cho tam giac ABC co goc A<90 do , AB=AC .Ke BD vuong goc voi AC(D thuoc AC), CE vuong goc voi AB 9 E thuoc AB). GOI O la giao diem cua BD va CE . CHUNG MINH RANG:
A) BD=CE
B)OE=OD;OB=OC
C) OAla tia phan giac cua goc BAC
ke ho minh hinh va neu gia thiet ket luan nhe !
