Вариант 2. 1. Выполните действия: A) 85 25 16 19 Б)-6; 24 8 B) 1:; 19 д 37 2 80 7 54 ; 75' - 7 E): 28; 25 ж) 8.5 ж)8 3 49 3) 6:; 7

A) \[ \frac{8}{25} \cdot \frac{16}{5} = \frac{8 \cdot 16}{25 \cdot 5} = \frac{128}{125} = 1 \frac{3}{125} \]

Б) \[ \frac{19}{24} \cdot 6 = \frac{19 \cdot 6}{24} = \frac{19 \cdot 1}{4} = \frac{19}{4} = 4 \frac{3}{4} \]

В) \[ 1 : \frac{8}{19} = 1 \cdot \frac{19}{8} = \frac{19}{8} = 2 \frac{3}{8} \]

Г) \[ \frac{37}{2} \cdot \frac{5}{80} = \frac{37 \cdot 5}{2 \cdot 80} = \frac{37 \cdot 1}{2 \cdot 16} = \frac{37}{32} = 1 \frac{5}{32} \]

Д) \[ \frac{5}{7} \cdot \frac{4}{5} = \frac{1 \cdot 4}{7 \cdot 1} = \frac{4}{7} \]

E) \[ \frac{7}{25} : 28 = \frac{7}{25} \cdot \frac{1}{28} = \frac{1}{25} \cdot \frac{1}{4} = \frac{1}{100} \]

Ж) \[ 8 \cdot \frac{5}{49} = \frac{8 \cdot 5}{49} = \frac{40}{49} \]

З) \[ 6 : \frac{3}{7} = 6 \cdot \frac{7}{3} = 2 \cdot 7 = 14 \]