http://www.texify.com/links.php 可以直接联结图片, 如 http://texify.com/img/$\int\frac{1}{1+x^2}=\arctan(x)$.gif
http://www.codecogs.com/components/equationeditor/equationeditor.php 有符号编辑器, 可以联结图片, 如 http://www.codecogs.com/eq.latex?x^n+y^n=z^n
http://www.bgoncalves.com/online/latex/ 有符号编辑器, 不清楚是否可以联结图片, 至少不是很方便.
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