1. Вычислите: a) (16-13-5). д) 12-4-76. 2. Вычислите: 754 a) 9 6 15 4 16 д) 17:21

Ответ:

1. 
   а)
   
   
   
   • 16 - 13 - 5 = 3 - 5 = -2
   
   
   
   


2. 
   д)
   
   
   
   • 12 - 4 - 76 = 8 - 76 = -68
   
   
   
   


3. 
   a)
   
   
   
   • \[\frac{7}{9} \cdot \frac{5}{6} : \frac{4}{15} = \frac{7}{9} \cdot \frac{5}{6} \cdot \frac{15}{4} = \frac{7 \cdot 5 \cdot 15}{9 \cdot 6 \cdot 4} = \frac{7 \cdot 5 \cdot 5}{3 \cdot 2 \cdot 4} = \frac{175}{24} = 7\frac{7}{24}\]
   
   
   
   


4. 
   д)
   
   
   
   • \[1\frac{4}{17} : \frac{16}{21} = \frac{21}{17} : \frac{16}{21} = \frac{21}{17} \cdot \frac{21}{16} = \frac{441}{272} = 1\frac{169}{272}\]
   
   
   
   

Ответ: