cho a,b,c la 3 canh cua tam giac
tm (a+b-2c)^2+(b+c-2a)^2+(c+a-2b)^2=(a-b)^2+(b-c)^2+(c-a)^2. tam giac ay la tam giac gi
cho a,b,c la 3 canh cua 1 tam giac CMR: A=a/(b+c-a) + b/(a+c-b) + c/(a+b-c) >=3
cho a ,b,c la do dai 3 canh cua tam giac
cmr: a2+b2+c2+2bc>0
Cho a,b,c la ba canh cua tam giac
CMR ab+bc+ca<=a^2+b^2+c^2<2(ab+bc+ca)
cho cac so duong a,b,c thoa man (a^2+b^2+c^2)^2>2*(a^4+b^4+c^4)
cm rang a,b,c la do dai ba canh cua tam giac.
cho a,b,c la 3 canh cua mot tam giac cmr
A=\(\frac{a}{b+c-a}+\frac{b}{a+c-b}+\frac{c}{a+b-c}\)
lon hon hoac bang 3
làm ơn giúp tui với
Bai 1:cho a,b,c la do dai 3 canh tam giac
CMR a^2016/b+c-a + b^2016/c+a-b + c^2016/a+b-c >= a^2015 +b^2015+c^2015
Bai 2;cho a,b,c la cac so thuc thoa man:0<=a,b,c<=4 va a+b+c=6
tim GTLN P=a^2+b^2+c^2 +ab+bc+ca
chung minh voi a,b,c la do dai 3 canh cua tam giac
\(a\left(b-c\right)^2+b\left(c-a\right)^2+c\left(a-b\right)^2>a^2+b^2+c^2\)
Cho a,b,c la so do 3 canh cua tam giac . Chung minh rang a2b+b2c+c2a+ca2+bc2+ab2-a3-b3-c3 > 0