\(\dfrac{3}{2}+\dfrac{3}{33}=\dfrac{3}{2}+\dfrac{1}{11}=\dfrac{33}{22}+\dfrac{2}{22}=\dfrac{33+2}{22}=\dfrac{35}{22}\)
Cho \(A=\dfrac{3^2}{1.4}+\dfrac{3^2}{4.7}+\dfrac{3^2}{7.10}+...+\dfrac{3^2}{31.24}\).Giá trị của \(A\) là:
\(A.\dfrac{99}{34}B.3\dfrac{33}{34}C.\dfrac{33}{34}D.\)Tất cả đều sai
giúp!
3/ Tính hợp lí :
a/ P = \(\dfrac{-2}{7}\) + \(\dfrac{14}{29}\) + \(\dfrac{12}{33}\) + \(\dfrac{15}{29}\) + \(\dfrac{21}{33}\) + \(\dfrac{2}{7}\)
b/ \(\dfrac{2}{7}\) . \(\dfrac{5}{19}\) + \(\dfrac{2}{7}\) . \(\dfrac{14}{19}\) + \(\dfrac{21}{19}\) - \(\dfrac{2}{7}\) . \(\dfrac{1}{5}\)
Tính:
a)\(\dfrac{6}{18}\)+\(\dfrac{-14}{21}\) b)\(\dfrac{3}{5}\)-\(\dfrac{-1}{2}\)
c)\(\dfrac{2}{7}\):\(\dfrac{3}{4}\) d) \(\dfrac{-28}{33}\).\(\dfrac{-3}{4}\)
Tìm x biết :
\(x+\dfrac{1}{2}=\dfrac{33}{4}\)
\(\dfrac{5}{6}-x=\dfrac{1}{3}\)
\(x+\dfrac{4}{5}=\dfrac{-2}{3}\)
tính một cách hợp lí:
a) \(\dfrac{-5}{18}+\dfrac{32}{45}-\dfrac{9}{10}\)
b) \(\left(\dfrac{-1}{4}+\dfrac{51}{33}-\dfrac{5}{3}\right)-\left(\dfrac{-15}{12}+\dfrac{6}{11}-\dfrac{42}{29}\right)\)
c) \(1-\dfrac{1}{2}+2-\dfrac{2}{3}+3-\dfrac{3}{4}+4-\dfrac{1}{4}-3-\dfrac{1}{3}-2-\dfrac{1}{2}-1\)
giải chi tiết giúp mình nha
(x+\(\dfrac{2}{3}\))+\(\dfrac{1}{11}\)=(\(\dfrac{10}{-33}\).\(\dfrac{11}{8}\)).\(\dfrac{24}{-55}\)
(11\(\dfrac{7}{18}\) - 9\(\dfrac{13}{18}\)): x - 1\(\dfrac{2}{33}\) : \(\dfrac{7}{11}\) = 1\(\dfrac{2}{3}\)
1, A= \(\dfrac{-3}{4}.\left(0,125-1\dfrac{1}{2}\right):\dfrac{33}{16}-25\%\)
2, B= \(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right):\dfrac{7}{3}\)
3, C= \(\dfrac{5}{16}:0,125-\left(2\dfrac{1}{4}-0,6\right).\dfrac{10}{11}\)
4, D= \(6\dfrac{5}{12}:2\dfrac{5}{4}+11\dfrac{1}{4}.\left(\dfrac{1}{3}-\dfrac{1}{5}\right)\)
Tìm x, biết:
\(\dfrac{3}{1.4}\)x + \(\dfrac{3}{4.7}\)x + \(\dfrac{3}{7.10}\)x +...+ \(\dfrac{3}{31.34}\)x = 33
