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Câu hỏi của Trần Thị Phương - Toán lớp 6 - Học toán với OnlineMath
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B=\(\left(\frac{1}{3}-1\right).\left(\frac{1}{6}-1\right).\left(\frac{1}{10}-1\right).\left(\frac{1}{15}-1\right).....\left(\frac{1}{1225}-1\right).\left(\frac{1}{1275}-1\right)\)
Thực hiện phép tính:
a) \(\left(\frac{1}{3}-1\right).\left(\frac{1}{6}-1\right).\left(\frac{1}{10}-1\right).\left(\frac{1}{15}-1\right)...\left(\frac{1}{1225}-1\right).\left(\frac{1}{1275}-1\right)\)
b) 1 - 2 + 3 - 4 + 5 - 6 + ... + 2011 - 2012
\(\left(\frac{1}{3}-1\right)\times\left(\frac{1}{6}-1\right)\times\left(\frac{1}{10}-1\right)\times\left(\frac{1}{15}-1\right)\times...\times\left(\frac{1}{1225}-1\right)\times\left(\frac{1}{1275}-1\right)\)=?
24 tháng 4 2016 lúc 20:19
Tính :
a) \(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right).\left(1-\frac{1}{15}\right).\left(1-\frac{1}{21}\right)...\left(1-\frac{1}{780}\right)\)
b) \(\left(1-\frac{1}{2}\right)+\left(1-\frac{1}{4}\right)+\left(1-\frac{1}{8}\right)+...+\left(1-\frac{1}{512}\right)+\left(1-\frac{1}{1024}\right)\)
Tínha) left(1-frac{1}{2}right)left(1-frac{1}{3}right)...left(1-frac{1}{2018}right)b) left(1-frac{1}{3}right)left(1-frac{1}{6}right)left(1-frac{1}{10}right)left(1-frac{1}{15}right)...left(1-frac{1}{190}right)c) left(1+frac{7}{9}right)left(1+frac{7}{20}right)left(1+frac{7}{33}right)left(1+frac{7}{48}right)...left(1+frac{7}{2009}right)
Đọc tiếp
Tính
a) \(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)...\left(1-\frac{1}{2018}\right)\)
b) \(\left(1-\frac{1}{3}\right)\left(1-\frac{1}{6}\right)\left(1-\frac{1}{10}\right)\left(1-\frac{1}{15}\right)...\left(1-\frac{1}{190}\right)\)
c) \(\left(1+\frac{7}{9}\right)\left(1+\frac{7}{20}\right)\left(1+\frac{7}{33}\right)\left(1+\frac{7}{48}\right)...\left(1+\frac{7}{2009}\right)\)
Tính a) left(1-frac{1}{2}right)left(1-frac{1}{3}right)...left(1-frac{1}{2018}right)b) left(1-frac{1}{3}right)left(1-frac{1}{6}right)left(1-frac{1}{10}right)left(1-frac{1}{15}right)...left(1-frac{1}{190}right)c) left(1+frac{7}{9}right)left(1+frac{7}{20}right)left(1+frac{7}{33}right)left(1+frac{7}{48}right)...left(1+frac{7}{2009}right)
Đọc tiếp
Tính
a) \(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)...\left(1-\frac{1}{2018}\right)\)
b) \(\left(1-\frac{1}{3}\right)\left(1-\frac{1}{6}\right)\left(1-\frac{1}{10}\right)\left(1-\frac{1}{15}\right)...\left(1-\frac{1}{190}\right)\)
c) \(\left(1+\frac{7}{9}\right)\left(1+\frac{7}{20}\right)\left(1+\frac{7}{33}\right)\left(1+\frac{7}{48}\right)...\left(1+\frac{7}{2009}\right)\)
Tính :
\(B=\left(1-\frac{1}{3}\right)\left(1-\frac{1}{6}\right)\left(1-\frac{1}{10}\right)\left(1-\frac{1}{15}\right)....\left(1-\frac{1}{210}\right)\)
Tính:
\(\left(1-\frac{1}{3}\right)\left(1-\frac{1}{6}\right)\left(1-\frac{1}{10}\right)\left(1-\frac{1}{15}\right).....\left(1-\frac{1}{780}\right)\)
Tính nhanh :
\(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right).\left(1-\frac{1}{15}\right).\left(1-\frac{1}{21}\right).\left(1-\frac{1}{28}\right)\)