Tim cac so a, b, c khac 0 thoa man: a + b - 2 / c = b + c +1 / a = c + a +1 / b = a + b +c / 2

tim 3 so a,b,c khac nhau va khac 0 thoa man : a/(b+c) = b/(a+c) = c/(a+b)

tim a,b,c khac 0 thoa man :a+b+c=(ab+ac)/2=(bc+ba)/3=(ca+cb)/4

Cho a b c khac 0 thoa man a/1=b/2=c/3.

CMR (a+b+c).(1/a+4/b+9/c)=36

cho a , b ,c khac 0 thoa man a + b + c = 0 tinh A = (1+a/b)(1+b/c)(1+c/a)

Cho 3 so  a,b,c khac 0 va doi mot khac nhau thoa man  a^2.(b+c)=b^2.(a+c)=2015 Tinh c^2.(a+b)

cho a,b,c khac 0 thoa man a^b=b^c=c^a

cho cac so thuc a, b,c khac 0 thoa man a^2*(a+b)=b^2*(b+c)=2016. tinh bieu thuc A=c^2*(a+c)

cho a b c la cac so nguyen khac 0 thoa man ab - ac + bc = c^2 -1. khi do a/b bang bn