已知(x+2)x+5=1, 则x=____ .
We should try to solve the food safety. It is a serious _______ in our country.
如图,点A与点A′在x轴上,且关于y轴对称,过点A′垂直于x轴的直线与抛物线y2=2x交于两点B,C,点D为线段AB 上的动点,点E在线段AC上,满足 |CE||CA|=|AD||AB| .
28.2的1.5倍减去31.9,所得的差再除以2.6,商是( )