x-1 / 2015 + x-3 / 2013 = x-5 / 2011 + x-7 / 2009
Những câu hỏi liên quan
Thực hiện tính: A = \(\frac{2015+2013+2011+2009+...+7+5+3+1}{2015-2013+2011-2009+.....+7-5+3-1}\)
Thực hiện tính: A = \(\frac{2015+2013+2011+2009+...+7+5+3+1}{2015-2013+2011-2009+.....+7-5+3-1}\)
a)(-1975)+(-1974)+.........+(-1)+0+1+............+2016
b)B=\(\frac{2015+2013+2011+2009+...........+7+5+3+1}{2015-2013+2011-2009+........+7-5+3-1}\)
a) 2x-1/11+2x-2/12+2x-3/13=2x+5/5+2x+6/4+2x+7/3
b) x-1/2016+x-2/2015+x-3/2014+x-4/2013+x-5/2012 -5=0
c) x+2017/2+x+2015/3+x+2013/4+x+2011/5+8=0
B1:Tính
a) A=1+2-3-4+5+6-7-8+...+2009+2010-2011-2012+2013
b) B=1+3+32+.....+32015
B2:Tìm số nguyên x
-7-3x chia hết cho x+4
x-1 / 2013 + x-2 / 2012 + x-3 / 2011 = x-4 / 2010 + x-5 / 2009 + x-6 / 2008
\(\dfrac{x-1}{2013}+\dfrac{x-2}{2012}+\dfrac{x-3}{2011}=\dfrac{x-4}{2010}+\dfrac{x-5}{2009}+\dfrac{x-6}{2008}\)
\(\Leftrightarrow\dfrac{x-1}{2013}-1+\dfrac{x-2}{2012}-1+\dfrac{x-3}{2011}-1=\dfrac{x-4}{2010}-1+\dfrac{x-5}{2009}-1+\dfrac{x-6}{2008}-1\)
=>x-2014=0
hay x=2014
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X+5/2015+1+x+6/2014+1+x+7/2013+1+x+8/2012+1+x+9/2011+1
\(\frac{7-x}{2009}+\frac{5-x}{2011}+\frac{3-x}{2013}=-3\)
giải pt
ta có pt trên <=> \(\frac{7-x}{2009}+1+\frac{5-x}{2011}+1+\frac{3-x}{2013}=0\)
<=> \(\frac{7-x}{2009}+\frac{2009}{2009}+\frac{5-x}{2011}+\frac{2011}{2011}+\frac{3-x}{2013}+\frac{2013}{2013}=0\)
<=> \(\frac{2016-x}{2009}+\frac{2016-x}{2011}+\frac{2016-x}{2013}=0\)
<=> \(\left(2016-x\right)\left(\frac{1}{2009}+\frac{1}{2011}+\frac{1}{2013}\right)=0\)
do \(\frac{1}{2009}+\frac{1}{2011}+\frac{1}{2013}\) >0
=> 2016-x=0
=> x=2016
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a) 2x-1/11+2x-2/12+2x-3/13=2x+5/5+2x+6/4+2x+7/3
b) x-1/2016+x-2/2015+x-3/2014+x-4/2013+x-5/2012 -5=0
c) x+2017/2+x+2015/3+x+2013/4+x+2011/5+8=0
giúp mình với mọi người làm ơn đi mình cần gấp lắm!!!!