1) Tìm GTLN của các phân số:
a) \(\dfrac{2016}{\left|x\right|+2017}\) b) \(\dfrac{\left|x\right|+2016}{-2017}\)
2) Tìm GTNN của các phân số:
a) \(\dfrac{\left|x\right|+1945}{1975}\) b) \(\dfrac{-1}{\left|x\right|+1}\)
3) CMR: S=\(\dfrac{1}{2}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{4}\)+\(\dfrac{1}{5}\)+...+\(\dfrac{1}{100}\)>\(\dfrac{99}{100}\)
tìm x
\(\dfrac{x+3}{2007}-\dfrac{x+3}{2008}=\dfrac{x+3}{2010}-\dfrac{x+3}{2009}\)
giúp mk vs..... đúng mk tik !!
1. Tìm x, biết
a. \(\dfrac{1}{2}x-\dfrac{3}{4}x-\dfrac{7}{3}=\dfrac{-5}{6}\)
b. \(Ix-\dfrac{1}{6}I+\dfrac{-5}{12}=\dfrac{4}{7}.\dfrac{14}{48}\)
BT3: Tìm x, biết
13) \(\left(-1\dfrac{1}{5}+x\right):\left(-3\dfrac{3}{5}\right)=\dfrac{-7}{4}+\dfrac{1}{4}:\dfrac{1}{8}\)
14) \(\dfrac{11}{13}-\left(\dfrac{5}{42}-x\right)=-\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)
Bài 1 : tìm x
a) x + \(\dfrac{3}{5}\) = \(\dfrac{1}{5}\)
b) \(\dfrac{-1}{2}\) - x = \(\dfrac{1}{3}\) - \(\dfrac{1}{-4}\)
c) \(\dfrac{x}{14}\) = \(\dfrac{1}{7}\) + \(\dfrac{-3}{14}\)
Tìm x biết:
\(\dfrac{3}{4}.x+\dfrac{1}{5}=\dfrac{1}{6}\)
b)(\(4\dfrac{1}{2}-\dfrac{2}{5}x\)):\(\dfrac{7}{4}=\dfrac{11}{14}\)
Tìm số tụ nhiên x biết rằng :
\(\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{10}+...+\dfrac{2}{x\left(x+1\right)}=\dfrac{2007}{2009}\)
Bài 1. tìm x, biết :
\(\dfrac{X}{2}+\dfrac{X}{14}+\dfrac{X}{35}+\dfrac{X}{65}+\dfrac{X}{104}+\dfrac{X}{209}=1\dfrac{3}{11}\)
tìm x:
a) \(-8:\left(4\dfrac{1}{5}x+\dfrac{3}{10}\right)=4\dfrac{4}{9}\)
b) \(4\dfrac{2}{3}-\left(\dfrac{3}{5}:x\right)=-20\%\)
c) \(\left(\dfrac{13}{10}x-15\right).-\dfrac{5}{14}=3\)
d) \(\left(5,5x-44\right):\left(-\dfrac{3}{2}\right)=30\)
e) \(\dfrac{11}{14}:\left(2x+\dfrac{5}{7}\right)=-\dfrac{11}{18}\)