1、(1)上,3/2,(0,3/2),y轴;
(2)下,3,(0,-3),y轴,< 0,> 0,= 0,大,大,-3
2、(1)左,2,(-2 ,0),过点(-2,0)且平行于y轴的直线;
(2)右,2,(2,0),过点(2,0)且平行于y轴的直线,> 2,< 2,= 2,小,小,0
3、(1)①③,②④;
(2)①②,③④;
(3)②④,2,0;
(4)①③,-1,0
4、图像①、②、③、④相应的二次函数表达式分别为:
y = 2(x - 1.5)²,y = 2(x + 1)²,y= 2x² - 2,y = -2x² - 0.5