thực hiện phép tính
A=\(100.\left(1+\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+...+\frac{9899}{9900}\right)\)
Tính nhanh
\(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+.....+\frac{9899}{9900}\)
TÍNH:
A= \(\frac{5}{6}+\frac{11}{12}+\frac{19}{20}+..........+\frac{9989}{9900}\)
\(\frac{1}{2}\)+\(\frac{5}{6}\)+\(\frac{11}{12}\)+...+\(\frac{9899}{9900}\)
\(A=\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+...+\frac{9899}{9900}\)
CHO A=\(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{2005.2006}\) 1/ RÚT GỌN A 2/ CHỨNG MINH A<1
Cho tổng A=1/2+5/6+11/12+19/20+...+9701/9702+9899/9900
Chứng tỏ A<99
Tìm x : \(\frac{6:\frac{3}{5}-1\frac{1}{16}\cdot\frac{6}{7}}{4\frac{1}{5}\cdot\frac{10}{11}+5\frac{2}{11}}\)\(-\frac{\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right)\cdot\frac{12}{49}}{3\frac{1}{3}+\frac{2}{9}}\)
viết lại bài tìm x
c, \(2-|\frac{3}{4}-x|-\frac{1}{12}\)
bài tính nhanh
\(a,5\frac{7}{5}\cdot4\frac{2}{7}+5\frac{5}{7}\cdot4\frac{2}{7}\)
\(b,\frac{-7}{11}\cdot\frac{4}{19}+\frac{-7}{19}\cdot\frac{7}{11}+2\frac{7}{19}\)
\(c,\frac{5}{7}\cdot\frac{1}{3}-\frac{5}{7}\cdot\frac{1}{4}-\frac{5}{7}\cdot\frac{1}{12}\)
làm nhanh lên nhé vì mai mình nộp rồi
Tính tổng dãy số sau : \(A=\frac{5}{2}+\frac{5}{6}+\frac{5}{12}+\frac{5}{20}+....+\frac{5}{9506}+\frac{5}{9702}+\frac{5}{9900}\)