\(2^{2016}.2^{x-1}=2^{2015}\)
\(2^{x-1}=\dfrac{2^{2015}}{2^{2016}}\)
2^2016 . 2^x-1=2^2015
2^x-1=2^2015 : 2^2016
2^x-1= 2^-1
=> x-1= -1
x = -1+1
x = 0
\(2^{2016}.2^{x-1}=2^{2015}\)
\(2^{x-1}=\dfrac{2^{2015}}{2^{2016}}\)
2^2016 . 2^x-1=2^2015
2^x-1=2^2015 : 2^2016
2^x-1= 2^-1
=> x-1= -1
x = -1+1
x = 0
Tim x; (1/2+ 1/3+ ...+1/2016).x=2015/1+ 2014/2+ ... +1/2015
cho x(1)+x(2)+....+x(2015)=0 và x(1)+x(2)+x(3)=.........= x(2013)+x(2014)+x(2015)=1
1/Tính nhanh: (12015 - 1012015)x(22015 - 1002015)x(32015 - 992015)x ... x(1012015 - 12015)
2/Tìm số nguyên n sao cho (n + 5) chia hết cho (n - 2)
Yêu cầu trả lời đầy đủ!
Tính nhanh: (12015 - 1012015)x(22015 - 1002015)x(32015 - 992015)x ... x(1012015 - 12015)
c)Tìm số tự nhiên x ,biết:
1)36-x:2=16
2)401(x-3)=2015^2015:2015^2104
Tìm x: 5x + 17 = x - 47
Tính nhanh: (12015 - 1012015) x (22015 - 1002015) x (32015 - 992015) x ... x (1012015 - 12015)
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
a, 2015 2015 ( - x ) = 2015 2015
b ,1 + 2 + 3 + 4 + ..........+ x = 378
c, x + 2x + 3x + ...........+ 99x = 2 + 4 + 6 + .............+ 198
Tìm x thuộc Z biết:
1) 2016+2015+2014+...+x = 2016
2) 1+2+3+...+x = 1275
3) | x+2015 | + | x+2016| = 1