Вопрос:

1. Есептеңдер: 1) 7,8 · 4/13 − 61,5 : 13 2/3 + 198,8; 2) 19,25 · 5/11 + 5,76 · 5/12 − 13,006; 3) 4,625 · 2 2/15 : 2,96 − 2 4/7; 4) 30,25 : 4 5/7 : 1,05 − 2 1/6.

Ответ:

  1. \(7.8\cdot\frac4{13}=2.4\), \(13\frac23=\frac{41}{3}\), сондықтан \(61.5:\frac{41}{3}=4.5\).
    \(2.4-4.5+198.8=196.7\). Жауабы: 196,7.
  2. \(19.25\cdot\frac5{11}=8.75\), \(5.76\cdot\frac5{12}=2.4\).
    \(8.75+2.4-13.006=-1.856\). Жауабы: −1,856.
  3. \(4.625=\frac{37}{8}\), \(2\frac2{15}=\frac{32}{15}\), \(2.96=\frac{74}{25}\).
    \(\frac{37}{8}\cdot\frac{32}{15}:\frac{74}{25}=\frac{20}{3}\).
    \(\frac{20}{3}-2\frac47=\frac{20}{3}-\frac{18}{7}=\frac{86}{21}=4\frac27\). Жауабы: \(4\frac27\).
  4. \(30.25:\frac{33}{7}:1.05=\frac{121}{4}\cdot\frac7{33}\cdot\frac{20}{21}=\frac{55}{9}\).
    \(\frac{55}{9}-2\frac16=\frac{55}{9}-\frac{13}{6}=\frac{77}{18}=4\frac5{18}\). Жауабы: \(4\frac5{18}\).