Các câu hỏi tương tự
Cho a,b,c la cac so nguyen duong thoa man: abc=1. CMR
\(\frac{1}{a^3\left(b+c\right)}+\frac{1}{b^3\left(c+a\right)}+\frac{1}{c^3\left(a+b\right)}\ge\frac{3}{2}\)
cho cac so duong a,b,c thoa man : ab+a+b=3
tim GTNN cua bieu thuc C=a^2+b^2
Cho cac so nguyen a, b, c. d thoa man \(a^3+b^3=2\left(c^3-8d^3\right)\). Chung minh rang \(a+b+c+d⋮3\)
cho cac so nguyen duong a,b,c thỏa man ab+a+b=3 tìm GTNN của a2+b2
cho cac so nguyen duong a,b,c thoa man :(a,b,c)=1;ab=c(a+b).Cm a+b la so chinh phuong
cho a,b,c la cac so thoa man (a+1)^2+(b+2)^2+(c+3)2<2010.tim GTNN cua bieu thuc A=ab+b(c-1)+c(a-2)
cho a,b,c,d la cac so nguyen duong doi 1 khac nhau thoa man a/a+b + b/b+c + c/c+d + d/d+a =2
CMR abcd la 1 so chinh phuong
Tim cac so nguyen duong thoa man: 1/x+1/y=2/3
cho cac so duong a,b,bc thoa man a+b+c=1/abc .chung ming (a+b)(a+c)>=2