Контрольные задания
Вопрос:Фото задания: 7) 1 1/14 − 5/12 =; 8) 1 4 2/3 − 1 7/9 =; 9) 3/5 − 5/13 =; 10) 12 1/45 − 8 2/27 =; 11) 9 1/4 − 2 7/25 =; 12) 1 3/22 − 5/77 =;…Фото задания

Ответ:

  1. \(1\frac{1}{14}-\frac{5}{12}=1+\frac{6-?}{?}\). Приведём дроби к знаменателю 84: \(\frac{1}{14}=\frac{6}{84}\), \(\frac{5}{12}=\frac{35}{84}\). Поэтому \(1-\frac{29}{84}=\frac{55}{84}\).
  2. \(1\frac{4}{3}-1\frac{7}{9}=\frac{16}{3}-\frac{16}{9}=\frac{48-16}{9}=\frac{32}{9}=3\frac{5}{9}\).
  3. \(\frac35-\frac5{13}=\frac{39-25}{65}=\frac{14}{65}\).
  4. \(12\frac1{45}-8\frac2{27}=4+\frac1{45}-\frac2{27}=4+\frac{3-10}{135}=3\frac{128}{135}\).
  5. \(9\frac14-2\frac7{25}=7+\frac{25-28}{100}=6\frac{97}{100}\).
  6. \(1\frac3{22}-\frac5{77}=1+\frac{21-10}{154}=1\frac{11}{154}=1\frac1{14}\).
  7. \(\frac7{12}-\frac1{18}=\frac{21-2}{36}=\frac{19}{36}\).
  8. \(5\frac16-\frac1{25}=5+\frac{25-6}{150}=5\frac{19}{150}\).
  9. \(9\frac{17}{60}-1\frac5{42}=8+\frac{119-25}{420}=8\frac{94}{420}=8\frac{47}{210}\).
  10. \(\frac58-\frac47=\frac{35-32}{56}=\frac3{56}\).
  11. \(16\frac5{16}-8\frac14=8+\frac5{16}-\frac4{16}=8\frac1{16}\).