\(\left(2x+5\right)^{2016}\ge0;\left(5y-4\right)^{2016}\ge0\)
=>\(\left(2x+5\right)^{2016}+\left(5y-4\right)^{2016}\ge0\)
theo đề:\(\left(2x+5\right)^{2016}+\left(5y-4\right)^{2016}\le0\)
=>(2x+5)2016=(5y-4)2016=0
ta có:(2x+5)2016=0=>2x=-5=>x=-5/2=-2,5
(5y-4)2016=0=>5y=4=>y=4/5=0,8
vậy y=0,8