Решите уравнения: 1) 28/47 + x = 40/47; 2) 28/41 − x = 11/41; 3) 29/89 + x = 47/89; 4) 40/83 − x = 16/83; 5) 16/67 + x = 66/67; 6) 77/85 − x = 24/85; 7) 43/91 + x = 67/91; 8) 46/77 + x = 71/77.

1. \(x=\frac{40}{47}-\frac{28}{47}=\frac{12}{47}\).
2. \(x=\frac{28}{41}-\frac{11}{41}=\frac{17}{41}\).
3. \(x=\frac{47}{89}-\frac{29}{89}=\frac{18}{89}\).
4. \(x=\frac{40}{83}-\frac{16}{83}=\frac{24}{83}\).
5. \(x=\frac{66}{67}-\frac{16}{67}=\frac{50}{67}\).
6. \(x=\frac{77}{85}-\frac{24}{85}=\frac{53}{85}\).
7. \(x=\frac{67}{91}-\frac{43}{91}=\frac{24}{91}\).
8. \(x=\frac{71}{77}-\frac{46}{77}=\frac{25}{77}\).

Ответ: \(\frac{12}{47};\ \frac{17}{41};\ \frac{18}{89};\ \frac{24}{83};\ \frac{50}{67};\ \frac{53}{85};\ \frac{24}{91};\ \frac{25}{77}\).