某班“數(shù)學(xué)興趣小組”對(duì)函數(shù)y=x2-2|x|的圖象和性質(zhì)進(jìn)行了探究,探究過程如下,請(qǐng)補(bǔ)充完整.
(1)自變量x的取值范圍是全體實(shí)數(shù),x與y的幾組對(duì)應(yīng)值列表如下:
x |
… |
-3 |
- |
-2 |
-1 |
0 |
1 |
2 |
|
3 |
… |
y |
… |
3 |
|
m |
-1 |
0 |
-1 |
0 |
|
3 |
… |
其中,m=
0
0
.
(2)根據(jù)表中數(shù)據(jù),在如圖所示的平面直角坐標(biāo)系中描點(diǎn),并畫出了函數(shù)圖象的一部分,請(qǐng)畫出該函數(shù)圖象的另一部分.
(3)觀察函數(shù)圖象,寫出兩條函數(shù)的性質(zhì).
(4)進(jìn)一步探究函數(shù)圖象發(fā)現(xiàn):
①函數(shù)圖象與x軸有
3
3
個(gè)交點(diǎn),所以對(duì)應(yīng)的方程x
2-2|x|=0有
3
3
個(gè)不相等的實(shí)數(shù)根;
②方程x
2-2|x|=2有
2
2
個(gè)不相等的實(shí)數(shù)根;
③關(guān)于x的方程x
2-2|x|=a有4個(gè)不相等的實(shí)數(shù)根時(shí),a的取值范圍是
-1<a<0
-1<a<0
.