chỉ cần tính tử thôi: 636363.37-373737.63
=63.10101.37-373737.63
=63.373737-373737.63
=0
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Tính tổng S = \(2015+\frac{2015}{1+2}+\frac{2015}{1+2+3}+...+\frac{2015}{1+2+3+...+2016}\)
Tính tổng:
\(S=2015+\frac{2015}{1+2}+\frac{2015}{1+2+3}+....+\frac{2015}{1+2+3+...+2016}\)
\(A=\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2015}+\frac{1}{2016}}{\frac{2015}{1}+\frac{2014}{2}+\frac{2013}{3}+...+\frac{1}{2014}+\frac{1}{2015}}\)
Tinh:
S=2015+\(\frac{2015}{1+2}\)+\(\frac{2015}{1+2+3}\)+\(\frac{2015}{1+2+3+4}\)+...+\(\frac{2015}{1+2+3+...+2016}\)
Tìm x biết:
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4029}{2014}+\frac{4030}{2015}\)
26 tháng 4 2015 lúc 13:54
Tìm x, biết:
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4030}{2015}\).
5 tháng 5 2015 lúc 21:31
Tìm x biết \(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right).x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4030}{2015}\)
tìm x biết \(\left(1+\frac{1}{2}+\frac{1}{3}+.....+\frac{1}{2015}\right)\times x+2015=\frac{2016}{1}+\frac{2017}{2}+.....+\frac{4029}{2014}+\frac{4030}{2015}\)
Tinh:
S=2015+\(\frac{2015}{1+2}\)+\(\frac{2015}{1+2+3}\)+...+\(\frac{2015}{1+2+3+...+2016}\)