\(=\dfrac{-11}{7}+\dfrac{1}{16}+\dfrac{6}{7}=\dfrac{-5}{7}+\dfrac{1}{16}=\dfrac{-80+7}{112}=\dfrac{-73}{112}\)
\(=\dfrac{-11}{7}+\dfrac{1}{16}+\dfrac{6}{7}=\dfrac{-5}{7}+\dfrac{1}{16}=\dfrac{-80+7}{112}=\dfrac{-73}{112}\)
\(tính\frac{-121}{77}+\frac{125}{2000}+\frac{30.63.65.8}{117.200.49}\)
\(\frac{\frac{5}{12}+\frac{1}{8}-\frac{7}{11}}{\frac{49}{11}-\frac{7}{8}-\frac{35}{12}}\)
\(\frac{5-\frac{5}{3}-\frac{5}{9}-\frac{5}{27}}{-8+\frac{8}{3}+\frac{8}{9}+\frac{8}{27}}:\frac{15-\frac{15}{11}-\frac{15}{121}}{16-\frac{16}{11}-\frac{16}{121}}\)
1 / giải phương trình sau:
\(\frac{1}{\left(x+2000\right).\left(x+2001\right)}+\frac{1}{\left(x+2001\right).\left(x+2002\right)}...\frac{1}{\left(x+2006\right)\left(x+2007\right)}=\frac{7}{8}\)
Tính ;\(\frac{2000}{123456^2-123457.123455}\)
( Toán lớp 7 ) giúp mình với !!!!!!
a) Tính : \(\left(\frac{3}{4}-81\right)\left(\frac{3^2}{5}-81\right)\left(\frac{3^3}{6}-81\right)....\left(\frac{3^{2000}}{2003}-81\right)\)
b) Tính giá trị của biểu thức : \(6x^2+5x-2\) tại x thoả mãn \(\left|x-2\right|=1\)
Tính \(P=\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2005}}{\frac{2004}{1}+\frac{2003}{2}+\frac{2002}{3}+...+\frac{1}{2014}}\)
Tính : B=\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+...+\frac{1}{9900}\)
tính tổng A = \(\frac{-1}{20}+\frac{-1}{30}+\frac{-1}{42}+\frac{-1}{56}+\frac{-1}{72}+\frac{-1}{90}\)
Tính:
S=\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}\)