Các câu hỏi tương tự
cho 3 so a,b,c co tong bang 1.CMR:1/a+1/b+1/c>=9
CMR voi a,b,c la cac so duong, ta co (a+b+c)(1/a+1/b+1/c)>=9
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 4 so nguyen duong a b c dsao cho a2 + b2 = c2+d2 .CMR: tong a+b+c+d la hop so
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
B1. Cho f(1)=1008,f(1)+f(2)+...+f(n)=n^2.f(n) f(n)la ham so duong
tinh f(2015)
B2 Cho cac so nguyen to q,p,r,s sao cho cac so sau deu la so nguyen to p^s+s^q,q^s+s^r,r^s+s^p
tim cac so p,q,r,s
B3 co a,b,c duong a mu 3+bmu3=c^3
so sanh a^2015+b^2015 va c^2015
cao nhan naoo giup em voi
1.cmr voi a,b,c la cac so duong ta co: (a+b+c)(1/a+1/b+1/c)>hoac =9
2.giai bat phuong trinh (x+3)(x-3),(x-2)^2+3
EM XIN CHAN THANH CAM ON CAC VI CAO NHAN >_<
Cho cac so duong x y z t co tong bang 1
CMR \(\frac{1}{x}+\frac{1}{y}+\frac{4}{z}+\frac{16}{t}\ge64\)
Cho cac so nguyen duong a b c thoa man
(a+1)^3+(b+2)^3+(c+3)^3=3(a+1)(b+2)(c+3)