1 . 下列命题中为真命题的是_____________ .(填序号)
①命题“若
,则
”的否命题;
②命题“若
,则
”的逆命题;
③命题“若
,则
”的否命题;
④命题“若
,则
”的逆否命题.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b21208364124b5c477b2ff8df1c2e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552d996f4748a1c0d22149f9ead89f02.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828765097c682c0b260c81e5bf6229a6.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34c5832f3fe28f48a924854cb8814ba.png)
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2 . 命题“若
,
,则
”的逆否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb20e291772c2614ad19f4cc919dfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ff131c51a4ef6745538c18cec92c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657435e1fda84118e7f63c97505c8b75.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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2023-02-25更新
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3 . 有下列四个命题:
①“若
,则
,
互为相反数”的逆命题;
②“全等三角形的面积相等”的否命题;
③“若
,则
有实根”的逆命题;
④“等边三角形的三个内角相等”的逆否命题;
其中真命题的序号是___________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②“全等三角形的面积相等”的否命题;
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f8c9a7302470b0de565fa20a0f5a68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d55dec8c5df4d73ded126f050748da1.png)
④“等边三角形的三个内角相等”的逆否命题;
其中真命题的序号是
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2022-12-07更新
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4 . 写出下列命题的逆命题、否命题以及逆否命题:
(1)若
,则
;
(2)已知
为实数,若
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ee4849f60afce5a3a85ccd492314e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0219e415740558b6d03038c91c9f3689.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d10449bc77d692a7270e0f20a68cdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648bb8829ffc34b7b466b1bb05777103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af27075a29a658a88bec069fe4804da.png)
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5 . 下列命题中正确的是( )
A.若![]() ![]() |
B.在![]() ![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() ![]() ![]() |
D.命题![]() ![]() ![]() ![]() ![]() |
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6 . 下列有关命题的表述中,正确的是( )
A.命题“若![]() ![]() ![]() |
B.命题“若![]() ![]() |
C.命题“若![]() ![]() ![]() ![]() |
D.若命题“![]() ![]() ![]() ![]() |
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7 . 命题“若
,则
”的逆否命题是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d9d76b59ec1414a1cdf7f49127610c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd8ba8bfcbf4c2e2c47e83403bd8902.png)
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8 . 设有下面四个命题:
,
;
,“
”是“
”的充分不必要条件;
命题“若
是有理数,则
是无理数”的逆否命题;
若“
”是真命题,则
一定是真命题.其中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8631b53e0de49ff1cb3be72741dc9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80c2b71c2e51ddca35edf6eb289ddeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e43adffa3c1d9239f8e4ed5fa3ee3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae3c3c8f3d94894cbd783960ca9c8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6084bef58aeb492bb09905316195fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428f740d77d1a1f4303effd6c1e87028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
9 . 命题“若
,
都是奇数,则
是偶数”的逆否命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
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10 . 命题“若
,则
”的逆否命题为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8966fbcbd107e23bdc4ada8cf3b67af3.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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