Question

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
64)(-3-(-6))/(-3)
65)-15+(-6+17)
66)-6+11-30+16

Answer 1

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

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

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

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


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

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

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

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


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