§ Задание 30
\[\boxed{\mathbf{30.}}\]
\[\textbf{а)}\ 34 + 0 = 34\]
\[17 - 0 = 17\]
\[25 - 25 = 0\]
\[\textbf{б)}\ 85 - (0 + 62) = 85 - 62 =\]
\[= 23\]
\[41 - 41 + 73 = 0 + 73 = 73\]
\[100 - (69 + 31) = 100 - 100 =\]
\[= 0\]
\[\boxed{\mathbf{30.}}\]
\[\textbf{а)}\ 34 + 0 = 34\]
\[17 - 0 = 17\]
\[25 - 25 = 0\]
\[\textbf{б)}\ 85 - (0 + 62) = 85 - 62 =\]
\[= 23\]
\[41 - 41 + 73 = 0 + 73 = 73\]
\[100 - (69 + 31) = 100 - 100 =\]
\[= 0\]