\(\dfrac{1}{25}\)+\(\dfrac{1}{625}\)+\(\dfrac{1}{3125}\)=\(\dfrac{125}{3125}\)+\(\dfrac{5}{3125}\)+\(\dfrac{1}{3125}\)
=\(\dfrac{131}{3125}\)
chúc bạn học tốt ạ
a)\(\dfrac{2}{7}+\dfrac{-3}{8}+\dfrac{11}{7}+\dfrac{1}{3}+\dfrac{1}{7}+\dfrac{5}{-8}\)
b)\(\dfrac{-3}{8}+\dfrac{13}{25}+\dfrac{5}{-8}+\dfrac{2}{-5}+\dfrac{13}{25}\)
\(A=1\dfrac{13}{15}.25.\dfrac{1}{100}.3+\left(\dfrac{8}{15}-\dfrac{78}{60}\right):1\dfrac{23}{24}\)
Tính nhanh ngay bây h nhé
\(\dfrac{0,8.\left(\dfrac{4}{5}.1,25\right)}{0,64-\dfrac{1}{25}}+\dfrac{\left(10,8-\dfrac{2}{25}\right):\dfrac{4}{7}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}.2\dfrac{2}{17}\right)}\)
Bài 1:
\(a)5\dfrac{1}{20}+\dfrac{8}{9}-\dfrac{15}{25}+\dfrac{75}{-18}\)
\(b)\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{63}+\dfrac{1}{99}+\dfrac{1}{143}\)
\(c)\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}.\dfrac{6}{7}+\dfrac{5}{8}:5-\dfrac{3}{16}.\left(-2\right)^2\)
Cho
\(A=\dfrac{1}{1.101}+\dfrac{1}{2.102}+\dfrac{1}{3.103}+...+\dfrac{1}{25.125}\)
\(B=\dfrac{1}{1.26}+\dfrac{1}{2.27}+\dfrac{1}{3.28}+...+\dfrac{1}{100.125}\)
Trong đó A có 25 số hạng,B có 100 số hạng.Tìm thương A:B
tính nhanh
\(40\dfrac{1}{2}+\left(37\dfrac{1}{3}-25\dfrac{1}{2}\right)-13\dfrac{1}{3}\)
a)\(\dfrac{2}{7}+\dfrac{-3}{8}+\dfrac{11}{7}+\dfrac{1}{7}_{ }+\dfrac{5}{-8}\)
b)\(\dfrac{3}{17}+\dfrac{-5}{13}+\dfrac{-18}{35}+\dfrac{14}{17}+\dfrac{17}{-35}_{ }+\dfrac{-8}{13}\)
c)\(\dfrac{-3}{8}+\dfrac{12}{25}+\dfrac{5}{-8}+\dfrac{2}{-5}+\dfrac{13}{25}\)
d)\(\dfrac{-5}{21}+\left(\dfrac{-16}{21}+1\right)\)
e)\(\dfrac{-3}{17}+\left(\dfrac{2}{3}+\dfrac{3}{17}\right)\)
f)\(\left(\dfrac{-1}{6}+\dfrac{5}{-12}\right)+\dfrac{7}{12}\)
Tìm x biết;
\(\dfrac{-3}{8}-\dfrac{1}{8}:x=-5\dfrac{1}{4}-2\dfrac{1}{4}\)
b)(1\(\dfrac{1}{3}-25\%-\dfrac{5}{12}\))-2x=1,6\(:\dfrac{3}{5}\)
1. Tính giá trị của biểu thức :
a) ( 1 - \(\dfrac{1}{3}\) ) . ( 1- \(\dfrac{1}{6}\) ) . ( 1 - \(\dfrac{1}{10}\) ) ...... ( 1 - \(\dfrac{1}{780}\) )
b) \(\dfrac{2^4}{7.15}+\dfrac{2^4}{15.23}+\dfrac{2^4}{23.31}+.....+\dfrac{2^4}{55.63}-\dfrac{6.\left(-14\right)-17.\left(-7\right).\left(-2\right)}{-22.28}\)
2. Tìm số tự nhiên n biết : \(\dfrac{4}{3.5}+\dfrac{8}{5.9}+\dfrac{12}{9.15}+.....+\dfrac{32}{n.\left(n+16\right)}=\dfrac{16}{25}\)
3. So sánh A và B biết :
a) A = \(\dfrac{2003.2004-1}{2003.2004}\) và B = \(\dfrac{2004.2005-1}{2004.2005}\)
b) A = \(\dfrac{10^{25}+1}{10^{26}+1}\) và B = \(\dfrac{10^{26}+1}{10^{27}+1}\)
