tìm x biết
\(\left(1+\frac{1}{2}+\frac{1}{3}+...........+\frac{1}{2015}\right)x+2015=\frac{2016}{1}+\frac{2017}{2}+............+\frac{4030}{2015}\)
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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:
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4030}{2015}\).
\(\Rightarrow\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=\left(\frac{2016}{1}-1\right)+\left(\frac{2017}{2}-1\right)+...+\left(\frac{4030}{2015}-1\right)\)
\(\Rightarrow\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=\frac{2015}{1}+\frac{2015}{2}+...+\frac{2015}{2015}\)
\(\Rightarrow\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=2015.\left(1+\frac{1}{2}+...+\frac{1}{2015}\right)\)
=> x = 2015
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5 tháng 5 2015 lúc 21:31
Tìm x biết \(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right).x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4030}{2015}\)
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right).x+2015=\frac{2016}{1}+\frac{2017}{2}+\frac{2018}{3}+...+\frac{4030}{2015}\)
\(\Rightarrow\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right).x=\left(\frac{2016}{1}-1\right)+\left(\frac{2017}{2}-1\right)+...+\left(\frac{4030}{2015}-1\right)\)
\(\Rightarrow\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right).x=\frac{2015}{1}+\frac{2015}{2}+...+\frac{2015}{2015}=2015.\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)\)\(\Rightarrow x=2015\)
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tìm x biết \(\left(1+\frac{1}{2}+\frac{1}{3}+.....+\frac{1}{2015}\right)\times x+2015=\frac{2016}{1}+\frac{2017}{2}+.....+\frac{4029}{2014}+\frac{4030}{2015}\)
Tìm x biết \(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)\). x + 2015 = \(\frac{2016}{1}+\frac{2017}{2}+...\frac{4029}{2014}+\frac{4030}{2015}\)
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=\left(1-\frac{2016}{1}\right)+\left(1-\frac{2017}{2}\right)+...+\left(1-\frac{4030}{2015}\right)\)
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=\frac{2015}{1}+\frac{2015}{2}+...+\frac{2015}{2015}\)
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x=2015\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)\)
\(\Rightarrow x=2015\)
Không hiểu thì hỏi mình nhé! Thiên dâng bữa nay chăm chỉ đột xuất ta???
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\(\left(\frac{1}{2}+\frac{2015}{2016}+\frac{2016}{2017}+1\right)\left(\frac{2105}{2016}+\frac{2016}{2017}+\frac{7}{22}\right)-\left(\frac{1}{2}+\frac{2015}{2016}+\frac{2016}{2017}\right)\left(\frac{2015}{2016}+\frac{2016}{2017}+\frac{7}{22}+1\right)\)
Cho A= \(\frac{1}{2015}+\frac{2}{2016}+\frac{3}{2017}+...................+\frac{2016}{4030}-2016\) và B= \(\frac{1}{2015}+\frac{1}{2016}+\frac{1}{2017}+...................+\frac{1}{4030}\) . Chứng minh rằng \(\frac{A}{B}\) là một số nguyên
Cho A= \(\frac{1}{2015}+\frac{2}{2016}+\frac{3}{2017}+...................+\frac{2016}{4030}-2016\) và B= \(\frac{1}{2015}+\frac{1}{2016}+\frac{1}{2017}+...................+\frac{1}{4030}\) . Chứng minh rằng \(\frac{A}{B}\) là một số nguyên
Cho: \(A=\frac{1}{2015}+\frac{2}{2016}+\frac{3}{2017}+..............+\frac{2016}{4030}-2016\)
và \(B=\frac{1}{2015}+\frac{1}{2016}+\frac{1}{2017}+.............+\frac{1}{4030}\)
Chứng minh rằng: \(\frac{A}{B}\) là một số nguyên