\[\boxed{\mathbf{76.}}\]
\[\textbf{а)}\ 625 + 1 = 626\]
\[1 + 100 = 101\]
\[229 + 1 = 230\]
\[483 - 1 = 482\]
\[350 - 1 = 349\]
\[210 - 1 = 209\]
\[\textbf{б)}\ 500 + 100 - 1 = 600 - 1 =\]
\[= 599\]
\[199 + 1 + 30 = 200 + 30 = 230\]
\[300 + 6 - 1 = 306 - 1 = 305\]