\(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{99}}+\frac{1}{2^{100}}+\frac{1}{2^{100}}\)
Giúp mk với...
Cho \(S=\frac{3}{4}+\frac{8}{9}+\frac{15}{16}+\frac{24}{25}+...+\frac{9999}{10000}\). Chứng minh rằng : S\(\notin\)N.
BT1; Tính;
a,2:\(\frac{-1}{3}\)+\(\frac{1}{3}\).\(\frac{2}{7}\)+\(\frac{1}{3}\).\(\frac{5}{7}\)
b,9,12+88%-1\(\frac{1}{5}\):\(\frac{1}{10}\)
c,\(\frac{5}{6}\)x+\(\frac{1}{4}\)x=\(\frac{1}{6}\)-\(\frac{5}{4}\)
thực hiện phép cộng:
a) \(\frac{2}{5}+\frac{3}{5}\)
b) \(\frac{1}{2}+\frac{-3}{4}\)
c) \(\frac{1}{2}+\frac{1}{3}+\frac{1}{9}\)
d)\(\frac{-9}{18}+\frac{6}{12}\)
CÂU HỎI: PHÉP CỘNG PHÂN SỐ CÓ CÁC TÍNH CHẤT NÀO?
Cộng các phân số:
a)\(\frac{7}{-32}+\frac{-9}{32}\)
b)\(\frac{-1}{4}+\frac{3}{4}\)
c)\(\frac{5}{33}+\frac{-2}{11}\)
d)\(\frac{12}{7}+\frac{12}{-5}\)
Tìm x, biết:
a)x=\(\frac{-1}{2}+\frac{3}{4}\)
b)\(\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}\)
CHỨNG TỎ:
\(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{10^2}< 1\)
Bt1; Tính;
a,\(\frac{1}{7}\)-\(\frac{4}{7}\)
b,\(\frac{2}{3}\)+\(\frac{1}{5}\).(\(\frac{-3}{4}\))
c,\(\frac{7}{23}\)+\(\frac{4}{17}\)-\(\frac{7}{23}\)+\(\frac{13}{17}\)
d,19\(\frac{1}{4}\).\(\frac{7}{12}\)-15\(\frac{1}{4}\).\(\frac{7}{12}\)
\(10+\frac{12}{1+2}+\frac{12}{1+2+3}+...+\frac{12}{1+2+3+...+2001}\)