1/2=1/2
1/3+1/4>1/4+1/4=1/2
1/5+…+1/8>4x1/8=1/2
1/9+…+1/16>8x1/16=1/2
1/2+1/3+1/4+…+1/16>4x1/2=2
1/2+1/3+1/4+…+1/63>1/2+1/3+1/4+…+1/16
suy ra: 1/2+1/3+1/4+…+1/63>2

đố mọi người nha:mik đang làm gì?

Bạn ghi đề nhầm rồi bạn, cho a=b=c=1 thì 2 vế đâu bằng nhau

\(\dfrac{1}{a+2}+\dfrac{1}{b+2}+\dfrac{1}{c+2}\ge1\Leftrightarrow\dfrac{2}{a+2}+\dfrac{2}{b+2}+\dfrac{2}{c+2}\ge2\)

\(\Leftrightarrow\dfrac{a}{a+2}+\dfrac{b}{b+2}+\dfrac{c}{c+2}\le1\)

\(\Rightarrow1\ge\dfrac{a^2}{a^2+2a}+\dfrac{b^2}{b^2+2b}+\dfrac{c^2}{c^2+2c}\ge\dfrac{\left(a+b+c\right)^2}{a^2+b^2+c^2+2\left(a+b+c\right)}\)

\(\Rightarrow a^2+b^2+c^2+2\left(a+b+c\right)\ge a^2+b^2+c^2+2\left(ab+bc+ca\right)\)

\(\Rightarrow\) đpcm

a: Ta có: \(A=1+3+3^2+3^3+...+3^{2015}\)

\(=\left(1+3\right)+3^2\left(1+3\right)+...+3^{2014}\cdot\left(1+3\right)\)

\(=4\cdot\left(1+3^2+...+3^{2014}\right)⋮4\)

b: Ta có: \(A=1+3+3^2+3^3+...+3^{2015}\)

\(=\left(1+3+3^2\right)+3^3\left(1+3+3^2\right)+...+3^{2013}\left(1+3+3^2\right)\)

\(=13\cdot\left(1+3^3+...+3^{2013}\right)⋮13\)