Tính GTBT:
\(A=\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
tìm x : \(\frac{1}{x}-\frac{1}{9999}=\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
NHANH + ĐÚNG = TICK (đang cần gắp mấy bạn giải nhanh hộ )
Tính nhanh tổng sau : \(A=\frac{3}{1.3}+\frac{3}{3.5}+\frac{3}{5.7}+...+\frac{3}{49.51}\)
Tính nhanh : \(A=\frac{21}{4}.\left(\frac{3333}{1212}+\frac{3333}{2020}+\frac{3333}{3030}+\frac{3333}{4242}\right)\)
Tính nhanh tổng sau : \(A=\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
TÍNH TỔNG :
a) \(\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+...+\frac{1}{24.25}\)
b) \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
c) \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{49.51}\)
d) \(\frac{5^2}{1.6}+\frac{5^2}{6.11}+\frac{5^2}{11.16}+\frac{5^2}{16.21}+\frac{5^2}{21.26}+\frac{5^2}{26.31}\)
\(A=\frac{1}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.6}+...+\frac{2}{97.99}\)
Giải thích giúp mình luôn nhé
A= \(\frac{1}{2.4}-\frac{1}{3.5}+\frac{1}{4.6}-\frac{1}{5.7}+.....-\frac{1}{97.99}+\frac{1}{96.98}-\frac{1}{97.99}\)
Tính hợp lí
\(\frac{1}{1.3}+\frac{1}{3.5}+...+\frac{1}{97.99}\)
\(A=\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.6}+...+\frac{2}{97.99}\)