cho a b c doi mot khac nhau khac 0 biet ab la so nguyen to va ab/bc=b/c tim abc(ab,bc,abc co gach ngang)

hay tim tat ca so nguyen duong  a,b,c doi mot nguyen to cung nhau sao cho a<b<c va a+b+c+ab+bc+ac chia het cho abc

lam duoc minh se tang tick

Tim ba so nguyen to a,b,c khac nhau sao cho abc<ab+bc+ac

Cho tam giac ABC. Ve doan thang AD vuong goc voi AB(D va C nam khac phia doi voi AB), AD=AB. Ve AE vuong goc voi AC(E va B nam khac phia doi voi AC), AE=AC. Biet DE=BC. Tinh goc BAC

tim so nguyen to ab  co 2 chu so khac nhau sao cho ba cung la 1 so nguyen to va ab - ba la 1 so chinh phuong

Cho a,b,c la cac chu so khac nhau va khac 0.Tim abc biet

a. abc=11.(a+b+c)

b. abc+bca+cab lamot so chinh phuong

c. abc+bca+cab=777

Bai 1: Tim ab ; biet ab = b x 9

Bai 2 : Tim ab, biet :

a) ab x 5 = 2ab                      b) ab = 4ab / 9.

Bai 3 : Tim ab, biet : a 2 = b x 5

Bai 4 : Tim cac so ab biet : 

a) a x3 = bx9                           b) a x4 = b x6.

Bai 5 :

a) Tim abc, biet a , b , c khac nhau va : a x bc = 91.

b) Tim a , b , c khac nhau biet aa x bc = 1001

Cho tam giac ABC . Ve cung tam A co ban kinh = BC , ve cung tam C co ban kinh = AB , chung cat nhau o M (M va B nam khac phia doi voi AC ) .Cmr : AM song song BC .

cho a,b,c la 3 so thuc doi mot khac nhau va khac khong, thoa man: a+1/b=b+1/c=c+1/a. hay chung minh rang abc=1 hoac abc=-1