Ответ:

1. а) \(\frac{3}{4}+0.37=0.75+0.37=1.12\).

б) \(\frac{5}{6}-0.25=\frac{5}{6}-\frac{1}{4}=\frac{10-3}{12}=\frac{7}{12}\).

в) \(\frac{7}{18}-0.2+\frac{1}{9}=\frac{7}{18}-\frac{1}{5}+\frac{2}{18}=\frac{1}{2}-\frac{1}{5}=\frac{3}{10}=0.3\).

2. \(x=\frac{11}{12}+\frac{7}{8}=\frac{22+21}{24}=\frac{43}{24}=1\frac{19}{24}\).

Ответ: 1а) 1,12; 1б) \(\frac{7}{12}\); 1в) 0,3; 2) \(x=1\frac{19}{24}\).