Cho a,b,c thoa man a+b+c=6 va ( a-1)^3 +(b-2)^3 +(c-3)^3 =0. Tinh T = (a-1)^2n+1 + (b-2)^2n+1 + (c-3)^2n+1
Cho cac so thuc phan a,b,c khac nhau doi mot va thoa man a^2-b=b^2-c=c^2-a . CMR (a+b+1)()b+c+1(c+a+1)=-1- de hsg tinh mon toan 9 nam 2012
cho a,b,c # doi 1 va a+b/c=b+c/a=c+a/b. tinh
M=(1+ a/b)(1+ b/c)(1+ c/a)
1: Cho a^2 + b^2 + c^2 = a^3 + b^3 + c^3 = 1. tinh gt cac bieu thuc : C = a^2 + b^9 + c^1945.
2: Cho hai so a va b thoa man: a^3 – 3a^2 + 5a – 17 = 0 va b^3 – 3b^2 + 5b + 11 = 0.hay tinh : D = a + b.
3: Cho a^3 – 3ab^2 = 19 va b^3 – 3a^2b = 98. hay tinh : E = a^2 + b^2.
Please...!!!! 1 bài thôi cgx đc nha (tốt nhất là cả) ^_^
CHO a;b;c thoa man abc=a+b+c va\(\frac{1}{a}\)+\(\frac{1}{b}\)+\(\frac{1}{c}\)=2
chung minh \(\frac{1}{a^2}\)+\(\frac{1}{b^2}\)+\(\frac{1}{c^2}\)=2
cho a+b+c=2 va 1/a^2+1/b^2+1/c^2=2 .Tinh a,b,c
cho a,b,c, la cac so duong thoa man a+b+c=1, c/m :1/a+1/b+1/c>=9
Cho a,b,c thoa man a+b+c=2018 va \(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{2018}\).
Chung minh co it nhat mot so la 2018