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歡迎您訪問數學考題練習:若關于x的方程ax+2=0與|x-1|-|x-!

數學考題練習:若關于x的方程ax+2=0與|x-1|-|x-

更新時間:2024-01-12 16:27:36作者:貝語網校

若關于x的方程ax+2=0與|x-1|-|x-2|+2=0有三個相異的實數根,則常數a的取值范圍是________.

試題答案

0<a<

試題解析

設y1=ax+2,y2=|x-1|-|x-2|+2,再根據直線y1=ax+2過點A(0,2),分析滿足題意的兩種極端情況,然后即使直線y1=ax+2與函數y2=|x-1|-|x-2|+2的圖象交于三個不同的點,即可.

解答:解:設y1=ax+2,y2=|x-1|-|x-2|+2

∴它的圖象是右圖中的折線

∵直線y1=ax+2過點A(0,2),

∴分析得出滿足題意的兩種極端情況如下:

當直線過圖中點B(2,3)時,2a+2=3得;

當直線平行于x軸時,由y=2可知a=0.

要使方程ax+2=0與|x-1|-|x-2|+2=0有三個相異的實數根.

即使直線y1=ax+2與函數y2=|x-1|-|x-2|+2的圖象交于三個不同的點,

則0<a<.

故答案為:0<a<.

點評:此題主要考查一次函數的綜合知識,難易程度適中,適合學生的訓練,是一道很典型的題目.

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