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【单选题】
下列说法： （1）函数 y= x-2 x-1 的自变量的取值范围是x≠1的实数； （2）等腰三角形的顶角平分线垂直平分底边； （3）在不等式两边同时乘以一个不为零的数，不等号的方向改变； （4）多边形的内角和大于它的外角和； （5）方程x 2 -2x-99=0可通过配方变形为（x-1） 2 =100； （6）两条直线被第三条直线所截，同位角相等． 其中，正确说法的个数是（ ）A.
2个
B.
3个
C.
4个
D.
5个
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皮皮学刷刷变学霸
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