fix equations in bit

diff --git a/docs/math/bit.md b/docs/math/bit.md
index 3f3ca94..2348a53 100644 (file)
--- a/docs/math/bit.md
+++ b/docs/math/bit.md
@@ -25,9 +25,9 @@ $$
 \begin{aligned}\r
 &5&=&&(101)_2\\\r
 &6&=&&(110)_2\\\r
-&5\text{\tt\,\&\,}6&=&&(100)_2&=\ 4\\\r
-&5\text{\tt\,|\,}6&=&&(111)_2&=\ 7\\\r
-&5\texttt{\ \!\^{}\ }6&=&&(011)_2&=\ 3\\\r
+&5\tt\,\&\,6\rm&=&&(100)_2&=\ 4\\\r
+&5\tt\,|\,\rm6&=&&(111)_2&=\ 7\\\r
+&5\tt\,\text{^}\,\rm6&=&&(011)_2&=\ 3\\\r
 \end{aligned}\r
 $$\r
 \r
@@ -45,7 +45,7 @@ $$
 \begin{aligned}\r
 5=(0000\ 0101)_2\\\r
 5\ 的补码=(1111\ 1010)_2\\\r
-\text{\tiny{～}\ }5=(1111\ 1010)_2\r
+\tt\ \text{~}\rm5=(1111\ 1010)_2\r
 \end{aligned}\r
 $$\r
 \r
@@ -63,8 +63,8 @@ $$
 $$\r
 \begin{aligned}\r
 &5&&=&&(101)_2\\\r
-&5\text{\tt\,<<\,}2&&=&&(10100)_2\!\!\!&=&&\!\!\!20\\\r
-&5\text{\tt\,>>\,}1&&=&&(10)_2&=&&2\r
+&5\tt\,\&\,\rm2&&=&&(10100)_2\!\!\!&=&&\!\!\!20\\\r
+&5\tt>>\rm1&&=&&(10)_2&=&&2\r
 \end{aligned}\r
 $$\r
 \r