函数img class=kfformula src=zzximg/20190808/1565253438624934.png data-latex=y=2-{x}^{2}/的单调递减区间是( )
①
img class=kfformula src=zzximg/20190808/1565253438117832.png data-latex=\left ( {0,+\infty } \right )/
②
img class=kfformula src=zzximg/20190808/1565253438467999.png data-latex=\left ( {-\infty ,0} \right )/
③
img class=kfformula src=zzximg/20190808/1565253438403956.png data-latex=\left ( {-\infty ,-1} \right )/
④
img class=kfformula src=zzximg/20190808/1565253438303182.png data-latex=\left ( {-1,+\infty } \right )/