$(1,0)$或$(\sqrt{2},0)$或$(2,0)$或$(-\sqrt{2},0)$
$解:(1)A(-4,-2),D(2,1)$ $(2)根據(jù)題意可知,只有C,D,E三個(gè)頂點(diǎn)能同時(shí)落在第一象限$ $∴此時(shí)要保證x軸在店C下方,經(jīng)過(guò)點(diǎn)B或在店B上方,$ $y軸在點(diǎn)C左方,經(jīng)過(guò)點(diǎn)B或在點(diǎn)B右方$ $∵每個(gè)臺(tái)階的寬是2$ $∴a的取值范圍是-2\lt a≤0$
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