Ta có

\(A=5^{11}+5^{12}+...+5^{200}=\left(5^{11}+5^{12}\right)+\left(5^{13}+5^{14}\right)+...+\left(5^{199}+5^{200}\right)\)

\(A=5^{10}\left(5+5^2\right)+5^{12}\left(5+5^2\right)+...+5^{198}\left(5+5^2\right)=\left(5^{10}+5^{12}+...+5^{198}\right).30\)

=>A chia hết cho 30

5/11+5/12+5/13+5/14

=115/132+5/13+5/14

=2155/1716+5/14

=1.612970363

5/11+5/12+5/13+5/14

=115/132+5/13+5/14

=2155/1716+5/14

=1.612970363

sai đề

a)\(\dfrac{-6}{11}:\left(\dfrac{3}{5}.\dfrac{4}{11}\right)=\dfrac{-5}{2}\)

b)\(\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{14}{30}=\dfrac{67}{370}\)

c)\(\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)=-\dfrac{169}{50}\)

d)\(\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)=\dfrac{115}{103}\)

=5^39/5^33

=5^6

=15625

bằng 25 

tui là người đầu tiên nhớ cho nhiều h nhé

giai thích đi