1 . 下列说法错误的个数是( )
①用反证法证明“已知:
中,
, 求证:
”时,应假设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab07a214b7b35e4f70d2922fa0f040d8.png)
②“到角的两边的距离相等的点在这个角的平分线上”的逆命题是真命题
③在平面直角坐标系中,点
关于原点对称的点的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631386549c0cec5981a1da47b05e5d25.png)
④多项式
与
的公因式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05de636879810855dab27451897e858e.png)
①用反证法证明“已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ad4a810a0e043b67f3dfe44a0e9bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab07a214b7b35e4f70d2922fa0f040d8.png)
②“到角的两边的距离相等的点在这个角的平分线上”的逆命题是真命题
③在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7078a4e8e927c163c7f98e66759c9834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631386549c0cec5981a1da47b05e5d25.png)
④多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0b18129d87ffd7d34ea23b9565fcfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03616931a04d6c937b3eb4742bda9783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05de636879810855dab27451897e858e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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