试试Latex的支持

国内博客对于Latex的支持都不太好，以往要输入公式用插入图片的方式实现，麻烦不说，还有可能在网速慢得情况下无法显示。看看到CSDN最新的博客编辑器Markdown支持Latex了赶紧过来试一下。

s′(r)(∑p+1i=1N′′i(r)(nkxuyi−nkyuxi))−s′′(r)(∑p+1i=1N′i(r)(nkxuyi−nkyuxi))s′(r)3 1

ukn(r_):=∑i=1p+1Ni(r)(nkxuxi+nkyuyi) 2

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1. \frac{s’(r) \left(\sum {i=1}^{p+1} N_i”(r) \left(\text{nkx} \text{uy}_i-\text{nky} \text{ux}_i\right)\right)-s”(r) \left(\sum {i=1}^{p+1} N_i’(r) \left(\text{nkx} \text{uy}_i-\text{nky} \text{ux}_i\right)\right)}{s’(r)^3}
   [^footnote]: \text{ukn}(\text{r _ })\text{:=}\sum _{i=1}^{p+1} N_i(r) \left(\text{nkx} \text{ux}_i+\text{nky} \text{uy}_i\right) ↩
2. \frac{s’(r) \left(\sum {i=1}^{p+1} N_i”(r) \left(\text{nkx} \text{uy}_i-\text{nky} \text{ux}_i\right)\right)-s”(r) \left(\sum {i=1}^{p+1} N_i’(r) \left(\text{nkx} \text{uy}_i-\text{nky} \text{ux}_i\right)\right)}{s’(r)^3}
   [^footnote]: \text{ukn}(\text{r _ })\text{:=}\sum _{i=1}^{p+1} N_i(r) \left(\text{nkx} \text{ux}_i+\text{nky} \text{uy}_i\right) ↩