Violympic toán 6
Các câu hỏi tương tự
1+\(\frac{1}{2}\)*(1+2)+\(\frac{1}{3}\)*(1+2+3)+\(\frac{1}{4}\)*(1+2+3+4)+...........+\(\frac{1}{20}\)*(1+2+3.....+20)
bài) Tính
a) 75%+1,2-2+1/5+20180
b) (-4/3+0,75) :2017/2018+(1+1/3-75%) :2017/2018
c) (2018-1/3-2/4-3/5-4/6-...-2018/2020) : (1/15+1/20+1/25+1/30+...1/10100)
bài) Tính
a) 75%+1,2-2+1/5+20180
b) (-4/3+0,75) :2017/2018+(1+1/3-75%) :2017/2018
c) (2018-1/3-2/4-3/5-4/6-...-2018/2020) : (1/15+1/20+1/25+1/30+...1/10100)
CMR
1-1/2+1/3-1/4+1/5-1/6+...+1/19-1/20=1/11+1/12+...+1/21
CMR \(1-\dfrac{1}{2}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{5}-\dfrac{1}{6}+...+\dfrac{1}{19}-\dfrac{1}{20}=\dfrac{1}{11}+\dfrac{1}{12}+\dfrac{1}{13}+...+\dfrac{1}{20}\)
CMR
1-1/2+1/3-1/4+1/5-1/6+...+1/19-1/20=1/11+1/12+...+1/21
chung minh 1-1/2+1/3-1/4+1/5-1/6+...+1/19-1/20=1/11+1/12+1/13+...+1/20.
chỉ giùm nha, mik đang cần rât rất là gấp
Bài1. (4điểm) Thực hiện phép tính:
a) \(A=\dfrac{3}{5}+6\dfrac{5}{6}\left(11\dfrac{5}{20}-9\dfrac{1}{4}\right):8\dfrac{1}{3}\)
b) \(B=\dfrac{-1}{2}+\dfrac{-1}{6}+\dfrac{-1}{12}+\dfrac{-1}{20}+\dfrac{-1}{30}+\dfrac{-1}{42}+\dfrac{-1}{56}+\dfrac{-1}{72}+\dfrac{-1}{90}\)
4 tháng 2 2021 lúc 12:31
a) Tính A ( 1 - dfrac{1}{2} )( 1 - dfrac{1}{3} ) (1-dfrac{1}{4} ) ....(1-dfrac{1}{2014} ) (1-dfrac{1}{2015} ) (1-dfrac{1}{2016} )b)Tìm x biết dfrac{x-2}{12} + dfrac{x-2}{20} + dfrac{x-2}{30}+ dfrac{x-2}{42} + dfrac{x-2}{56} +dfrac{x-2}{72} dfrac{16}{9}
Đọc tiếp
a) Tính A = ( 1 - \(\dfrac{1}{2}\) )( 1 - \(\dfrac{1}{3}\) ) (1-\(\dfrac{1}{4}\) ) ....(1-\(\dfrac{1}{2014}\) ) (1-\(\dfrac{1}{2015}\) ) (1-\(\dfrac{1}{2016}\) )
b)Tìm x biết \(\dfrac{x-2}{12}\) + \(\dfrac{x-2}{20}\) + \(\dfrac{x-2}{30}\)+ \(\dfrac{x-2}{42}\) + \(\dfrac{x-2}{56}\) +\(\dfrac{x-2}{72}\) = \(\dfrac{16}{9}\)