\(\dfrac{-3}{20}+\dfrac{-25}{20}=\dfrac{-28}{20}=\dfrac{-7}{5}\)
Đây nha bn
\(\dfrac{-3}{20}+\dfrac{-25}{20}=\dfrac{-28}{20}=\dfrac{-7}{5}\)
Đây nha bn
tính tổng các phân số sau:
a)\(\dfrac{1}{1.2}\)+\(\dfrac{1}{2.3}\)+\(\dfrac{1}{3.4}\)+❓+\(\dfrac{1}{2003.2004}\)
b)\(\dfrac{1}{1.3}\)+\(\dfrac{1}{3.5}\)+\(\dfrac{1}{5.7}\)+❓\(\dfrac{1}{2003.2005}\)
3/ Giải thích vì sao :
a/ \(\dfrac{20}{30}\) = \(\dfrac{30}{45}\) ; b/ \(\dfrac{-25}{35}\) = \(\dfrac{-55}{77}\)
\(\dfrac{1}{5}\)+\(\dfrac{1}{13}\)+\(\dfrac{1}{25}\)+...+\(\dfrac{1}{10^2}\)+\(\dfrac{1}{11^2}\)< \(\dfrac{9}{20}\)
Chứng tỏ rằng biểu thức trên bé hơn 9/20
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= \(6\dfrac{5}{12}:2\dfrac{5}{4}+11\dfrac{1}{4}.\left(\dfrac{1}{3}-\dfrac{1}{5}\right)\)
\(1\dfrac{13}{15}\) . 0,75 - \((\dfrac{11}{20}\) + 25%) : \(\dfrac{7}{3}\)
Help me!!!! Giúp tớ với ạ🥺👉🏻👈🏻
Tính nhanh
A = \(\dfrac{1}{2}\) + \(^{\dfrac{1}{3}}\) + \(\dfrac{1}{6}\) + \(\dfrac{1}{12}\) + \(\dfrac{1}{15}\) + \(\dfrac{1}{20}\) + \(\dfrac{1}{25}\) + \(\dfrac{1}{30}\) + \(\dfrac{1}{35}\) + \(\dfrac{1}{42}\) + \(\dfrac{1}{56}\) + \(\dfrac{1}{63}\)
Mình đang cần gấp , mong mn giúp mình với ạ
\(\dfrac{12}{10} ; \dfrac{15}{25} ; \dfrac{16}{20} tăng dần\)
\(\dfrac{3}{20}\)x\(\dfrac{7}{16}\)+\(\dfrac{3}{20}\)x\(\dfrac{5}{16}\)+\(\dfrac{3}{20}\)\(\dfrac{3}{10}\)
Tìm tỉ số \(\dfrac{A}{B}\)biết:
A = \(\dfrac{2}{1.5}+\dfrac{3}{5.11}+\dfrac{4}{11.19}+\dfrac{5}{19.29}+\dfrac{6}{29.41}\)
B = \(\dfrac{40}{31.39}+\dfrac{35}{39.46}+\dfrac{30}{46.52}+\dfrac{25}{52.57}+\dfrac{20}{57.61}\)
Giải nhanh giúp mình nha. Cảm ơn nhiều :3