jackeyblog apm <script type="text/javascript" async src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML"> </script> formula1: $$n==x$$ formula2: $$n!=x$$ formula3: (m==y) formula4: [m!=y] formula5: (k==z) formula6: [k!=z]