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等式成立的条件是A.a≥-1B.a≤1C.-1<a≤1D.-1≤a≤1
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等式
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ckcAAAAASUVORK5CYII=
)
成立的条件是( )
A.a≥-1
B.a≤1
C.-1<a≤1
D.-1≤a≤1
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