giai ho minh voi
tim ti le thuc a/b =c/d[a,b,ckhac 0,a khac±b,c khac ±d
CAU A, a-b/b=c-d/d
cho 2/a=1/b+1/c(a,b,c khac 0,a khac c).Chung minh rang b/c=b-a/a-c
cho 1/c=1/2(1/a+1/b)với a,b,c khác 0,b khac c
cmr a/b=a-c/c-b
Cho 2/a=1/b+1/c (a,b,c khac 0 , a khác c) CMR b/c=b-a/a-c
cho a , b ,c khac 0 thoa man a + b + c = 0 tinh A = (1+a/b)(1+b/c)(1+c/a)
cho a,b,c khac 0 ; a++b+c khac 0 thoa man \(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{a+b+c}\)
CMR\(\frac{1}{a^{2009}}+\frac{1}{b^{2009}}+\frac{1}{c^{2009}}=\frac{1}{a^{2009}+b^{2009}+c^{2009}}\)
Cho a,b,c khac 0 va a+b+c=0. Tính (1+a/b)(1+b/c)(1+c/a)
cho a,b,c khac 0 va a+b-c/c =b+c-a/a=c+a-b/b tinh p=(1+b/a)(1+c/b)(1+a/c)
cho a/b =b/c =c/a va a+b+ckhac 0 biet a =2012 tinh b,c
