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\(\left(2013+...\cdot\frac{3}{2014}\right):3=672\)
\(\left(2013+2014.\frac{3}{2014}\right):3=672\)
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\(=\frac{\left(1.2.3.....2014\right)}{\left(2.3.4.5.6....2015\right)}=\frac{1}{2015}\)
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Tính
1 1/3 là hỗn số đúng không ta? :))
\(\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1+\frac{1}{3}-1\frac{1}{3}\right)\)
\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times\left(1\frac{1}{3}-1\frac{1}{3}\right)\)
\(=\left(2013\times2014+2014\times2015+2015\times2016\right)\times0\)
\(=0\)
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Đặt phân thức trên là D
=> D=(1+1+1+1+...+1+2013/2+2012/3+...+2/2013+1/2014)/(1/2+1/3+1/4+...+1/2014)
=> D=(1+2013/2+1+2012/3+1+2011/4+...+1+2/2013+1+1/2014+1)/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=(2015/2+2015/3+2015/4+...+2015/2013+2015/2014+1)/(1/2+1/3+1/4+...+1/2014)
=> D=[2015*(1/2+1/3+1/4+1/5+....+1/2014)]/(1/2+1/3+1/4+1/5+...+1/2014)
=> D=2015
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\(\left[x+2\right]+\left[x+3\right]+\left[x+4\right]+.....+\left[x+2013\right]=2013+2014\)
\(\left[x+x+....+x\right]+\left[2+3+4+......+2013\right]=4027\)
\(2012x+2027090=4027\)
\(2012x=4027-2027090\)
\(2012x=-2023063\)
\(x=-2023063:2012\)
\(x=-\frac{2023063}{2012}\)
[x+2]+[x+3]+....+[x+2013] = 2013+2014
=> x+2+x+3+...+x+2013 = 4027
=> (x+x+x+..+x) +(2+3+4+...+2013) = 4027
=> 2012x + 2027090 = 4027
=> 2012x = -2023063
=> x = \(\frac{-2023063}{2012}\)
Đề không rõ ràng. Bạn xem lại nhé.