a)Không quy đồng mẫu số hãy tính giá trị của các biểu thức sau theo cách nhanh nhất:

\(A=\frac{3}{11}.\frac{4}{13}+\left(\frac{3}{13}.\frac{4}{11}-\frac{1}{13}\right);B=\frac{2011.2013-2012}{1+2013.2010}.\frac{5+\frac{5}{7}-\frac{5}{13}+\frac{5}{1001}-\frac{5}{11}}{\frac{8}{7}+\frac{8}{1001}-\frac{8}{13}-\frac{8}{11}+8}\)

b)Không quy đồng mẫu số hãy so sánh :\(C=\frac{2011}{2012}+\frac{2012}{2013}+\frac{2013}{2011}\)với 3

c)So sánh : C=1.3.5.7.9.....99 với \(D=\frac{51}{2}.\frac{52}{2}.\frac{53}{2}....\frac{100}{2}\)

Ai làm được mk xin tặng 5 - 7 tick

bài 1 So sánh

a)\(A=\frac{3}{8^3}+\frac{7}{8^4}\)    ;         \(B=\frac{7}{8^3}+\frac{3}{8^4}\)

b)\(A=\frac{10^{1992}+1}{10^{1991}+1};B=\frac{10^{1993}+1}{10^{1992}+1}\)

c)\(A=\frac{10^7+5}{10^4-8};B=\frac{10^8+6}{10^8-7}\)

d)\(A=\frac{1+5+5^2+...+5^9}{1+5+5^2+...+5^8};B=\frac{1+3+3^2+...+3^9}{1+3+3^2+...+3^8}\)

e)\(A=\frac{2011}{2012}+\frac{2012}{2013};B=\frac{2011+2012}{2012+2013}\)

Tính

\(1\frac{5}{7}-\frac{5}{7}.\frac{2}{11}-\frac{5}{7}.\frac{9}{11}\)

\(\frac{3}{11}.\frac{7}{19}.\frac{17}{11}.\frac{3}{9}-\frac{3}{19}.\frac{15}{11}\)

\(\frac{5}{11}.\frac{18}{29}-\frac{5}{11}.\frac{8}{29}+\frac{5}{11}.\frac{19}{26}\)

\(\frac{17}{23}.\frac{8}{16}.\frac{27}{17}.80.\frac{3}{4}\)

\(\left(\frac{13}{23}+\frac{1313}{2323}-\frac{131313}{232323}\right).\left(\frac{1}{3}+\frac{1}{4}-\frac{7}{12}\right)\)