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【OG20-P181-228题】
How many of the integers that satisfy the inequality (x+2)(x+3)x−2 ≥0 are less than 5?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
用零点分段法计算,x不等于2,题中隐含条件就是(x+3)*(x+2)*(x-2) 大于等于0,将数轴分为四段,从最右边一段开始,即,大于2的成立,-2~2的不成立,-2~-3的成立,小于-3的不成立,结合x小于5,所以一共四个,-3,-2,3,4
173113pkal
(x+3)*(x+2)*(x-2) 大于等于0这个结果怎么算出来的呀,从而怎么推到出来(x-2)为分母的啊?
288762fblyv
x不可以等于2呀,我真是有点思路立刻得意然后粗心
499685skw
穿针引线法则:1)所有X的系数相乘:正,从右上穿;负,从右下穿。2)奇过偶切。哔哩哔哩上的解说:https://www.bilibili.com/video/av15267805/?vd_source=0797877deed292fb785c43f6a150565d
willowX
把x不等于2忘了
ElisaGo
x同时还要小于5,不是不等式左边小于5
ziqi
分母不能为0
贾思敏
x不能等于2,因为x-2是分母。然后两边同时乘以(x-2)的平方,运用穿针引线法,搞掂!
锤子的爱情
分母不能为0,我大意了 没有闪
米粒要上720
穿针引线法: 自上而下,自右而左,原不等式求解得 【-3,-2】or x>2, 因为x-2 在父母上,x不能等于2, 有个陷阱,所以最后就是-3,-2,3,4
emily666
-2~2为什么不成立呀
emily666回复emily666
知道了
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2020-05-01 22:04:59
1289311ww
less than 5是小於5 不是小於等於5
赤木青帝
数轴标根法!查了好久才找到这个高中的专有名词
210
gmat的坑我每次都往里跳,我真谢谢你了
小邋遢考九分
这道题整数,不光考虑正整数还应当考虑扶正整数,正整数中3,4,-2,-3都是答案 而且分母不可以为2,分式无意义,这就是第5 个选项的陷阱
傲游2018
就是记得分好情况吧,要么同正要么同负还有等于0不能忘。
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