一道九年级科学题,I need some help已知（mn）是两位数,二次函数y=x^2+mx+n的图象与轴交与不同的两点,这两点间距离不超过2.{(mn)是指一个整体,m在十位,n在个位}1：求证：0小于m^2-4n小于等于42：求

一道九年级科学题,I need some help已知（mn）是两位数,二次函数y=x^2+mx+n的图象与轴交与不同的两点,这两点间距离不超过2.{(mn)是指一个整体,m在十位,n在个位}1：求证：0小于m^2-4n小于等于42：求 九年级上科学题 i need some sleep是什么意思 i need some more of I need some m----pens I need some masks ( ) Halloween. i need some ______(money) I Need Some Money 歌词 第九题 学霸,I need some help think的否定句some要改成any吗例如 I think he has some money 改否定句 我们老师说是I don't think he has some money.但今天做到一道题.think we need some apples,too.改否定句老师又说是I don't think we need any apples,eit Sorry、I think I need some idiot 科学九年级填空一题 求九年级科学测试题 i need some sleep 是什么风格 I Need Some Sleep 的空间链接 I need some sleep 属于什么风格. I need some (much) water to drink. I need some informations哪里错了?