(x + 1) + (x + 2) + (x + 3) + .... + (x + 2013) = 20132014
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 2013) = 20132014
2013x + 2027091 = 20132014
2013x = 20132014 - 2027091
2013x = 18104923
=> x =8994,000497
1.Tính:
1000+999-998+997+...+48-47
2.Tìm các chữ số a,b,c sao cho:
2001a+2004b+2007c=20132014
3. Tìm x :
5^x-1 - 5^x=100
Tính:
$\frac{\frac{2013}{2}+\frac{2013}{3}+\frac{2013}{4}+......+\frac{2013}{2014}}{\frac{2013}{1}+\frac{2012}{2}+\frac{2011}{3}+......+\frac{1}{2013}}$20132 +20133 +20134 +......+20132014 20131 +20122 +20113 +......+12013
a, x+1/2013+x+1/2014+x+1/2015=x+1/2016+x+1/2017
b,x-1/2013+x-2/2014+x-3/2015=x-4/2016-2
Tìm x: (1+1/2+1/3+...+1/2013).x+2013=2014/1+2015/2+...+4025/2012+4026/2013
Tìm x biết:
(1 + 1/2 + 1/3 +...+ 1/2013) . x + 2013= 2014/1+2015/2+... + 4025/2012 + 4026/2013
Giup minh nka:
1) So sanh:
A=10^2013+2/10^2013-1 va B=10^2013/10^2013-3
2) Tim x
a) 3^x-15.3^8=14.3^8
b)1/3+1/6+1/10+...+2/x(x+1)=49/50
Thank you, minh se chon cau tra li dau tien
cho x(1)+x(2)+....+x(2015)=0 và x(1)+x(2)+x(3)=.........= x(2013)+x(2014)+x(2015)=1
x +(x + 1) +(x +2) +(x+3)+....+( x +2013) =2035147
Tìm x biết (2012/1+2011/2+...+1/2012)/(1/2+1/3+...+1/2013):x=-2013/2014
