P
phamanhngoc100


cho 3 so duong thoa ab+bc+ca=1 cmr
can(a^3 +1) +can(b^3 +1)+ can(c^3+1) >=2can(a+b+c)
can o day co nghia la can bac hai . do em chua biet cach ghi mong may anh thong cam
can(a^3 +1) +can(b^3 +1)+ can(c^3+1) >=2can(a+b+c)
can o day co nghia la can bac hai . do em chua biet cach ghi mong may anh thong cam