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下列说法中正确的是( ) A.每个命题都有逆命题 B.每个定理都有逆定理 C.真...
下列说法中正确的是( )
A.每个命题都有逆命题
B.每个定理都有逆定理
C.真命题的逆命题是真命题
D.假命题的逆命题是假命题
考点分析:
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正确的是( )
A.
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B.
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C.
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D.
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如果反比例函数
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的图象经过点(-1,2),那么这个反比例函数的图象一定经过点( )
A.(
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,2)
B.(
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,2)
C.(2,-1)
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D.
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下列各式中,正确的是( )
A.a
6+a
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12B.a
4•a
4=a
16C.(-a
2)
3=(-a
3)
2D.(a-b)
2=(b-a)
2
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