tìm x biết (x+1)+(x+2)+...+(x+2013)
Tìm x , biết : (1+1/2+1/3+...+1/2013).x+2013=2014/1+2015/2+...+4026/2013
Tìm x biết:
(1 + 1/2 + 1/3 +...+ 1/2013) . x + 2013= 2014/1+2015/2+... + 4025/2012 + 4026/2013
tìm x biết (1/2 + 1/3 + 1/4 + .... + 1/2014 ) . x = 2013/1 + 2012/2 + ...+ 1/2013
Tìm x biết a |3-2x|=x+1
b (1/2+1/3+...+1/2014)×x=2013/1+2012/2+...+2/2012+1/2013
Tìm x biết (2012/1+2011/2+...+1/2012)/(1/2+1/3+...+1/2013):x=-2013/2014
Tìm x biết: (x+1) + (x+2) + ...+(x+2013) = 0
(x + 1) + (x + 2) + ...+(x + 2013) = 0
=> 2013x + ( 1 + 2 + 3 + .... + 2013 ) = 0
Áp dụng công thức tính dãy số ta có :
\(1+2+3+....+2013=\frac{\left[\left(2013-1\right):1+1\right].\left(2013+1\right)}{2}=\frac{2013.2014}{2}=2027091\)
=> 2013x + 2027091 = 0
=> 2013x = -2027091
=> x = -1007
( x + 1 ) + ( x + 2 ) + ... + ( x + 2013 ) = 0
( x + x + x + ... + x ) + ( 1 + 2 + 3 + ... + 2013 ) = 0
2013x + 2027071 = 0
2013x = 0 - 2027071
2013x = -2027071
x = ( -2027071 ) : 2013
Tự tính nhé
2013x+(1+2+...+2013)=0
2013x+2027091 =0
2013x =0-2027091=-2027091
x =-2027091:2013=-1007
tìm x biết :(x+1)+(x+2)+........+(x+2013)=2013.2014
Ta có: (x+1)+(x+2)+...+(x+2013)=2013.2014
<=>2013x+2027091=4054182
<=>2013x=2029091
<=>x=1007
(x+1) + (x+2) + ..........+ (x+2013) = 4054182
x+1 + x+2 + ..........+ x+2013 = 4054182
(x+x+x+x+..........+x) + (1+2+3+4+..........+2013) = 4054182
2013x + (1+2013) . 2013 : 2 = 4054182
2013x + 2027091 = 4054182
2013x = 4054182 - 2027091
2013x = 2027091
x = 2027091 : 2013
x = 1007
Tìm x biết: |x+1|+|x+2|+|x+3|+...+|x+2013|=2014x
(x.2013)+(1+2...+2013)=2014x
(x.2013)+......a...........=2014x
a=2014x-2013x
a=1.x
suy ra a=x(tu tim a)
Ta có :
|x+1| 0
|x+2| 0
..........
|x+2013| 0
=> 2014.x 0
Mà 2014 >0 nên x 0
=> (x+1) + (x+2) + (x+3) + ... + (x+2013) = 2014x
Mỗi ngoặc trên là một số hạng
=> x.2013 + (1+2+3+...+2013)=2014x
=>1+2+3+...+2013=x
hay x=1+2+3+...+2013
x=
(còn lại chị tự tính, mong chị thông cảm)
\(\left(1+2+...+2012+2013\right)+\left(x+x+...+x\right)\)=\(2014x\)
=\(\left(1+2+...+2013\right)+100x=2014x\)
= \(2027091\times100x=2014x\)
\(100x=2014x\div2027091\)
\(100x=2014x\times\frac{1}{2027091}\)
\(100x=\frac{2014x\times1}{2027091}\)
\(100x=\frac{2x}{2013}\)
\(x=\frac{2x}{2013}\div100\)
\(x=\frac{2x}{2013}\times\frac{1}{100}\)
\(x=\frac{x}{100650}\)
\(x=x\div100650\)
\(x=x\times\frac{1}{100650}\)
\(\Rightarrow x\times\frac{1}{100650}-x\)=\(\frac{1}{100650}\times x-x\)
\(=\frac{1}{100650}\)
Tìm số nguyên x biết :
( X-3)+ (X-2)+(X-1)+........+ 2012+2013 =2013
0000000000000000000000000000000000000000000000000000000
2012
âm 2012