Помогите решить: (/-это дробь) 61)45:36/13 -13,6+13/8 62)37:23/17-17,8+1 2/7 63)(-20+4)/4...

$61)45: \frac{36}{13}-13,6+ \frac{13}{8} =4,275$

$45: \frac{36}{13}= \frac{45}{1}*\frac{13}{36}= \frac{5}{1}* \frac{13}{4}= \frac{65}{4}=16,25$

$16,25 - 13,6 = 2,65$

$2,65+ \frac{13}{8}=2,65+1,625=4,275$

$62)37: \frac{23}{17}-17,8+1 \frac{2}{7}=54 \frac{27}{161}$

$37: \frac{23}{17}= \frac{37}{1}*\frac{17}{23}= \frac{629}{23}$

$\frac{629}{23} -17,8= \frac{629}{23}-\frac{178}{10}= \frac{10*629-23*178}{230}= \frac{6290-4094}{230}= \frac{2196}{230}=\frac{1098}{115}$

$\frac{1098}{115}+1 \frac{2}{7}= \frac{1098}{115}+\frac{1*7+2}{7}= \frac{7*1098+115*9}{805}= \frac{7686+1035}{161}= \frac{8721}{161}=54 \frac{27}{161}$

63) (-20 +4)/4 = -16/4 = -4

64) (-3 - (-6))/(-3) =(-3 + 6)/ (-3) = 3/(-3) = -1

65) -15 + (-6+17) = -15 + 11 = -4

66) -6 + 11 - 30 + 16 = 5 - 30 + 16 = -25 + 16 = -9