Tính nhanh:
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
Tính nhanh:
\(\frac{4}{2.4}+\frac{4}{4.6}+...+\frac{4}{98.100}\)
Tính nhanh:
\(\frac{1}{2.4}+\frac{1}{4.6}+...+\frac{1}{98.100}\)
Tính nhanh
\(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}\)
Tính nhanh
\(\frac{0,75+\frac{3}{7}+\frac{3}{11}}{2\frac{1}{4}+\frac{9}{11}+\frac{9}{7}}\)
M=\(\frac{\frac{3}{5}+\frac{3}{7}+\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}+\frac{4}{11}}\)
tính nhanh:
tính nhanh
A=\(\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+...+\frac{1}{3^8}\)
\(\frac{1}{10}+\frac{1}{40}+\frac{1}{88}+\frac{1}{154}+\frac{1}{238}+\frac{1}{340}\)
giúp mình tính nhanh nhé!
Tính nhanh:
\(A=\frac{0,75_{ }-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{3}}\)
