=>x/3=5/8+1/8=6/8=3/4
=>x=9/4
=>x/3=5/8+1/8=6/8=3/4
=>x=9/4
tìm số nguyên x ϵ Z, biết :
\(\dfrac{1}{2}\) + \(\dfrac{-1}{3}\)+\(\dfrac{-2}{3}\) ≤ x < \(\dfrac{-3}{5}\) + \(\dfrac{1}{6}\) + \(\dfrac{-2}{5}\) + \(\dfrac{3}{2}\)
Chứng minh rằng hai phân số sau tối giản với mọi số tự nhiên n
\(\dfrac{n+1}{2n+3}\) \(\dfrac{2n+3}{4n+8}\) \(\dfrac{3n+2}{5n+3}\)
\(\dfrac{5}{17}+\dfrac{2}{3}-\dfrac{20}{12}+\dfrac{7}{9}+\dfrac{12}{17}=\)
Tìm x : \(\dfrac{1}{10}+\dfrac{1}{15}+\dfrac{1}{21}+....+\dfrac{2}{x.\left(x+1\right)}=\dfrac{2010}{2012}\)
\(\dfrac{-24}{-6}\)=\(\dfrac{x}{3}\)=\(\dfrac{4}{y^2}\)=\(\dfrac{z^3}{-2}\)
tìm số đối của các tổng sau :
a) \(\dfrac{1}{-2}\) + \(\dfrac{2}{3}\)
b) \(\dfrac{-3}{4}\) + \(\dfrac{-4}{3}\)
c) \(\dfrac{7}{-2}\) + \(\dfrac{-3}{4}\)
d)-2 + \(\dfrac{3}{-4}\)
\(-\dfrac{3}{4}\)=\(\dfrac{x}{20}\)=\(\dfrac{21}{y}\)
A =\(\dfrac{2n+1}{n-3}\)+ \(\dfrac{3n-5}{n-3}\)- \(\dfrac{4n-5}{n-3}\). tìm giá trị của n để
a, A là 1 ps
b, A là 1 số nguyên
(\(\dfrac{1}{9}\) - 1) . (\(\dfrac{1}{16}\) - 1) . (\(\dfrac{1}{25}\) - 1) .....(\(\dfrac{1}{361}-1\)).(\(\dfrac{1}{400}-1\))