Question

(6 7/12-3 17/36)∙1/2-4 1/3:13/20.

Answer 1

1)6 7/12 - 3 17/36 = 79/12 - 125/36 = (79 × 3  -  125 × 1)/36 = 237/36  -  125/36 =  112/36 = 28/9 = 3 1/9
2)3 1/9  ×  1/2 = 28/9  ×  1/2 =  14/9 = 1 5/9
3)4 1/3  ÷  13/20 = 13/3  ÷  13/20 = 13/3  ×  20/13 =  20/3 = 6 2/3
4)1 5/9  -  6 2/3 = 14/9  -  20/3 =  (14 × 1  -  20 × 3)/9 = 14/9  -  60/9 =  - 46/9 = - 5 1/9
Ответ : - 5 1/9

Answer 2

$(6 \frac{7}{12} - 3 \frac{17}{36}) * \frac{1}{2} - 4 \frac{1}{3}: \frac{13}{20} = \\ \\ ( \frac{79}{12} - \frac{125}{36} ) * \frac{1}{2} - \frac{13}{3} : \frac{13}{20} = \\ \\ ( \frac{237^|^3}{36}- \frac{125^|^1}{36} ) * \frac{1}{2} - \frac{13}{3} : \frac{13}{20} = \\ \\ \frac{112}{36}* \frac{1}{2} - \frac{13}{3} : \frac{13}{20} = \\ \\ \frac{112*1}{36*2} -\frac{13}{3} : \frac{13}{20} = \\ \\ \frac{112}{72} - \frac{13}{3} : \frac{13}{20}=$ 
$\frac{112}{72} - \frac{13}{3} : \frac{13}{20} = \\ \\ \frac{112}{72} - \frac{13}{3}* \frac{20}{13} = \\ \\ \frac{112}{72} - \frac{13}{3}* \frac{20}{3} = \\ \\ \frac{14}{9} -\frac{60}{9} = -5 \frac{1}{9}; \\ \\ \\ OTBET: - 5 \frac{1}{9}$