∑ni=0i2=(n2+n)(2n+1)6 $sum_{i=0}^n i^2 = frac{(n^2+n)(2n+1)}{6}$log2x $log_2 x$α,β,…,ω alpha, eta, …, omegaΓ,Δ,…,Ω:Γ,Δ,…,Ω Gamma, Delta, …, Omega: Γ,Δ,…,Ωx2i $x_i^2x10 与x10 的区别$x^{10}$与$x^10$x2i 和xi2 $x_i^2$和$x_{i^2}$(2+3)[4+4] $(2+3)[4+4]$(x√y3)
9.1x√ $sqrt x$9.2
xy $frac{x}{y}$(x√y3)
自动调整公式$left(frac{sqrt x}{y^3} ight)$[x] $[x]${x} ${x}$|x $vert x$∥x $Vert x $
http://meta.math.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference