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【多选题】
指数函数 y = a x ( a > 0, a ≠ 1)满足( ).
A.
图形过点(0,1) 因为 a 0 =1,即曲线过点(0,1).
B.
是单调函数 指数函数 y = a x 是单调函数.
C.
是有界函数 指数函数不是有界函数.
D.
函数值都大于零 因为 a x >0.
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