Question

Помогите пажалуйста))

Answer 1

1)2,7*(-6 2/3)=-27/10*20/3=-18
2)13,25-2 9/20=13,25-2,45=10,8
3)10,8-18=-7,2
4)-7,2:2,8=-72/10*10/28=-2 4/7
5)-2 4/7+1 17/21=-2 12/21+1 17/21=-1 33/21+1 17/21=-16/21

Answer 2

$(13,25-2frac{9}{20}+2,7cdot (-6frac{2}{3})):2,8+1frac{17}{21}=\\=( frac{53}{4}-frac{49}{20}-frac{27}{10}cdot frac{20}{3}):frac{14}{5}+frac{38}{21}=\\=(frac{53}{4}-frac{49}{20}-18)cdot frac{5}{14}+frac{38}{21}=\\= frac{53cdot 5-49-360}{20} cdot frac{5}{14}+frac{38}{21}=-frac{144}{20}cdot frac{5}{14}+frac{38}{21}=\\=-frac{36}{14}+ frac{38}{21}= frac{-36cdot 3+38cdot 2}{42} = -frac{32}{42} =-frac{16}{21}$

Answer 3

Да, я вместо 360 написала 540.