( 2014 x 2015 + 2016 + 2007 ) x ( 1 + 1/2 : 1 1/2 - 1 1/3 )
= (4058210+2016+2007) x (1+1/3-1/1/3)
= 4062233 x 0
= 0
( 2014 x 2015 + 2016 + 2007 ) x ( 1 + 1/2 : 1 1/2 - 1 1/3 )
= (4058210+2016+2007) x (1+1/3-1/1/3)
= 4062233 x 0
= 0
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 thuộc Z biết:
1) 2016+2015+2014+...+x = 2016
2) 1+2+3+...+x = 1275
3) | x+2015 | + | x+2016| = 1
Tim x; (1/2+ 1/3+ ...+1/2016).x=2015/1+ 2014/2+ ... +1/2015
chứng minh m= 1 x 3 x 5 x 7 x2013 x 2015 +2 x4 x6 x 8 .... 2014 x 2016 chia hết cho 2007
tính nhanh : ( 2013 x 2014 + 2014 x 2015 + 2015 x 2016 ) x ( 1 + 1/3 - 1 và 1/3 )
so sánh A= 1/1 x 2 x 3 + 1/2 x 3 x 4 + 1/3 x 4 x 5 + ...+ 1/ 2014 x 2015 x 2016 với 1/4
1) Tìm GTNN của các biểu thức:
a) P= (|x-3|+2)2 + |y+3|+2007
b) Q= |x-2008| + |x-2009|
3) A= |2x-2|+|2x-2013|
4) B= |2013-x| + |2014-x|
5) C= |x-2014|+|2015-x|+|x-2016|
6) D= |x-2|+|x-9|+|x+1945|
Tìm x biết:
\(\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2015}\right)x+2015=\frac{2016}{1}+\frac{2017}{2}+...+\frac{4029}{2014}+\frac{4030}{2015}\)
Tính S = 1/2(1+2) + 1/3(1+2+3)+...+ 1/2015(1+2+...+2014+2015) + 1/2016(1+2+...+2015+2016)