Question

Вычелите 12*2 1/6; 14*2 11/14; 24*5 5/12; 15*1 1/30.

Answer 1

12*2 1/6=12*13/6=2*13/1=26/1=26
14*2 11/14=14*39/14=1*39/1=39/1=39
24*5 5/12=24*65/12=2*65/1=130/1=130
15*1 1/30=15*31/30=1*31/2=31/2=15 1/2

Answer 2

1)
$12 \times 2 \: \frac{1}{6} = 12 \times \frac{13}{6} = \frac{12 \times 13}{1 \times 6} = \\ \\ = \frac{2 \times 13}{1 \times 1} = \frac{26}{1} = 26$
ответ: 26

2)
$14 \times 2 \: \frac{11}{14} = 14 \times \frac{39}{14} = \frac{14 \times 39}{1 \times 14} = \frac{1 \times 39}{1 \times 1} = \frac{39}{1} = 39$

ответ: 39.

3)
$24 \times 5 \: \frac{5}{12} = 24 \times \frac{65}{12} = \frac{24 \times 65}{1 \times 12} = \frac{2 \times 65}{1 \times 1} = \frac{130}{1} = 130$

ответ: 130

4)
$15 \times 1 \: \frac{1}{30} =15 \times \frac{31}{30} = \frac{15 \times 31}{1 \times 30} = \frac{1 \times 31}{1 \times 2} = \frac{31}{2} = 15.5$
ответ: 15,5