Question

aratati ca ,,n'' este pătrat perfect
n=2015+2×(1+2+3_______+2014
va rog dau coroana urgent!!!!!@

Answer 1

n= 2015+ 2* ( 1+2+3+.....+2014) = 2015 + 2*(2014*2015 )/2 = 2015 + 2014*2015 = 2015( 1+ 2014) = 2015 ^ 2 patrat perfect

Answer 2

n=2015+2×(1+2+3+.....+2014)=
=2015+2×2014×2015/2=
=2015+2014×2015=
=2015×(1+2014)=
=2015×2015=
=2015²  deci patrat perfect