Контрольные задания
Вопрос:Фото задания: Вычислите: 3/8 + 1/6; 5/9 − 1/3; 2/5 + 3/10; 7/12 − 1/8; 4/7 + 1/3; 5/6 − 2/5; 1/4 + 2/9 − 1/6; 3/5 − 1/10 + 1/2; 7/8 − 1/4 +…Фото задания

Ответ:

  1. \(\frac38+\frac16=\frac9{24}+\frac4{24}=\frac{13}{24}\).
  2. \(\frac59-\frac13=\frac59-\frac39=\frac29\).
  3. \(\frac25+\frac3{10}=\frac4{10}+\frac3{10}=\frac7{10}\).
  4. \(\frac7{12}-\frac18=\frac{14}{24}-\frac3{24}=\frac{11}{24}\).
  5. \(\frac47+\frac13=\frac{12}{21}+\frac7{21}=\frac{19}{21}\).
  6. \(\frac56-\frac25=\frac{25}{30}-\frac{12}{30}=\frac{13}{30}\).
  7. \(\frac14+\frac29-\frac16=\frac9{36}+\frac8{36}-\frac6{36}=\frac{11}{36}\).
  8. \(\frac35-\frac1{10}+\frac12=\frac6{10}-\frac1{10}+\frac5{10}=1\).
  9. \(\frac78-\frac14+\frac13=\frac{21}{24}-\frac6{24}+\frac8{24}=\frac{23}{24}\).
  10. \(\frac23+\frac15-\frac1{15}=\frac{10}{15}+\frac3{15}-\frac1{15}=\frac{12}{15}=\frac45\).