\[\boxed{\mathbf{1.}\mathbf{57}}\]
\[\textbf{а)}\ 41,354\ :m + 170,791\ :n\]
\[m = 100;\ \ n = 10:\]
\[41,354\ :100 + 170,791\ :10 =\]
\[= 0,41354 + 17,0791 =\]
\[= 17,49264\]
\[\textbf{б)}\ 633,74x - 9878\ :y\]
\[x = 100;\ \ y = 1000:\]
\[633,74 \cdot 100 - 9878\ :1000 =\]
\[= 63\ 374 - 9,878 = 63\ 364,122\]