Theo tui thì :
\(\frac{12}{1.4.7}=\frac{12}{6}\left(\frac{6}{1.4}-\frac{6}{4.7}\right)\)
Theo tui thì :
\(\frac{12}{1.4.7}=\frac{12}{6}\left(\frac{6}{1.4}-\frac{6}{4.7}\right)\)
Đơn giản biểu thức sau
\(A=\frac{\frac{12}{13}+\frac{12}{131}-\frac{12}{1313}+\frac{12}{13131}}{\frac{15}{13}+\frac{15}{131}-\frac{15}{1313}+\frac{15}{13131}}\)
\(\left(19-\frac{5}{8}:\frac{7}{12}-13\frac{1}{4}:\frac{7}{12}\right).\frac{4}{5}\)
Tính : B=\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+...+\frac{1}{9900}\)
\(P=\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{11}}{\frac{5}{12}+1-\frac{7}{11}}\)
\(\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{11}}{\frac{5}{12}+1-\frac{7}{11}}\)
Tính nhanh\(\frac{12}{1.4}+\frac{12}{4.7}+\frac{12}{7.10}+......+\frac{12}{97.100}\)
bạn nào biết giải 2 cách càng tốt
ths nhìu
\(\frac{\frac{5}{12}+\frac{1}{8}-\frac{7}{11}}{\frac{49}{11}-\frac{7}{8}-\frac{35}{12}}\)
\(\frac{5-\frac{5}{3}-\frac{5}{9}-\frac{5}{27}}{-8+\frac{8}{3}+\frac{8}{9}+\frac{8}{27}}:\frac{15-\frac{15}{11}-\frac{15}{121}}{16-\frac{16}{11}-\frac{16}{121}}\)
tính nhanh A=\(\frac{7}{8}:\left(\frac{2}{9}-\frac{1}{18}\right)+\frac{7}{18}:\left(\frac{1}{6}-\frac{5}{12}\right)\)
Help: Cho A=\(\frac{1}{2^2}+\frac{1}{4^2}+\frac{1}{6^2}+\frac{1}{8^2}+\frac{1}{10^2}+\frac{1}{12^2}+\frac{1}{14^2}\).Hãy so sánh A với \(\frac{1}{2}\)