=3/5-3/8+...+3/608-3/611
=3/5-3/611
=1818/3055
Đúng 0
Bình luận (0)
Các câu hỏi tương tự
\(\frac{3}{5\times8}+\frac{3}{8\times11}+\frac{3}{11\times14}+.........+\frac{3}{605\times608}+\frac{3}{608\times611}\)
TÍNH NHANH:\(\frac{1}{1\times3\times5}+\frac{1}{2\times5\times8}+\frac{1}{3\times5\times7}+\frac{1}{5\times8\times11}+\frac{1}{5\times7\times9}+\frac{1}{8\times11\times14}+...+\frac{1}{995\times997\times999}+\frac{1}{1493\times1496\times1499}\)
Tìm x biết :
\(\frac{1}{5\times8}+\frac{1}{8\times11}+\frac{1}{11\times14}+.....+\frac{1}{x\times\left(x+3\right)}=\frac{101}{1540}\)
Tính:
\(A=\frac{3}{2\times5}+\frac{3}{5\times8}+\frac{3}{8\times11}+...+\frac{3}{29\times32}\)
So sánh
\(\frac{3}{\frac{9}{11}}\); \(\frac{\frac{3}{9}}{11}\);\(\frac{3}{9+11}\)và\(\frac{3}{9\times11}\).
Tính giá trị biểu thức sau : 6 \(\frac{3}{5}:6-\frac{1}{8}\times8+\frac{1}{3}\times\frac{3}{50}\)
tính :\(\frac{1}{1\times2\times3}+\frac{1}{2\times3\times4}+\frac{1}{3\times4\times5}+\frac{1}{4\times5\times6}+\frac{1}{5\times6\times7}+\frac{1}{6\times7\times8}+\frac{1}{7\times8\times9}+\frac{1}{8\times9\times10}\)
\(\frac{1}{2\times4}+\frac{1}{4\times6}+\frac{1}{6\times8}+...+\frac{1}{12\times14}=?\)
Tìm a biết $frac{1}{3times7}+frac{1}{7times11}+frac{1}{11times15}+...+frac{1}{atimes(a+4)}frac{50}{609}$13×7+17×11+111×15+...+1a×(a+4)50609.
Đáp số: a
Đọc tiếp
Tìm a biết $\frac{1}{3\times7}+\frac{1}{7\times11}+\frac{1}{11\times15}+...+\frac{1}{a\times(a+4)}=\frac{50}{609}$.
Đáp số: a =