\[Стр.\ 88.\]
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)}\ (0,35 - x) \cdot 0,46 = 0,092\]
\[0,35 - x = 0,092\ :0,46\]
\[0,35 - x = 9,2\ :46\]
\[0,35 - x = 0,2\]
\[x = 0,35 - 0,2\]
\[x = 0,15.\]
\[\textbf{б)}\ (x - 0,08) \cdot 0,37 = 0,148\]
\[x - 0,08 = 0,148\ :0,37\]
\[x - 0,08 = 14,8\ :37\]
\[x - 0,08 = 0,4\]
\[x = 0,40 - 0,08\]
\[x = 0,32.\]
\[\textbf{в)}\ (1,77 - 0,3x)\ :0,36 = 4,5\]
\[1,77 - 0,3x = 4,5 \cdot 0,36\]
\[1,77 - 0,3x = 1,62\]
\[0,3x = 1,77 - 1,62\]
\[0,3x = 0,15\]
\[x = 0,15\ :0,3\]
\[x = 1,5\ :3\]
\[x = 0,5.\]
\[\textbf{г)}\ (2,61 - 4x)\ :0,03 + 4,6 = 90\]
\[\ (2,61 - 4x)\ :0,03 = 90 - 4,6\]
\[(2,61 - 4x)\ :0,03 = 85,4\]
\[2,61 - 4x = 85,4 \cdot 0,03\]
\[2,61 - 4x = 2,562\]
\[4x = 2,61 - 2,562\]
\[4x = 0,048\]
\[x = 0,048\ :4\]
\[x = 0,012.\]
\[49.\ Калькулятор\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ 804\ 359 + 149\ 876 =\]
\[= 954\ 235\]
\[\textbf{б)}\ 3\ 246\ 835 - 986\ 359 =\]
\[= 2\ 260\ 476\]
\[\textbf{в)}\ 3124 \cdot 186 = 581\ 064\]
\[\textbf{г)}\ 6570\ :125 = 52,56\]
\[\boxed{\mathbf{2.}}\]